Somebody help me with this...Math is not Favorite subject...?

Question

1.(-4)(-11)
2.(4x+9)(3x-5)
3.m2 - 81
m+9 m+9
4.factor 25x2y4 - 64x4y4
5.2x - y= -1
x + y= 7....On this one do you match up like terms??

Hey,You really don't have to give me just the (straight answer)..I wanna learn how to do this..I haven't seen this sence the tenth grade..THANKS GOD BLESS..explain it to me please

Answer 1

Well here are a few:
(-4)(-11) is saying -4 x -11
4 x 11 = 44 ( two negative numbers multiplied together is a positive so the answer is 44)

2. (4x + 9) (3x - 5)
set it up like a multiplication problem
4 x + 9
3 x - 5
-----------
12x^2 + 27 x
- 20 x - 45
-----------------------
12 x^2 + 7 x - 45

(remember to multiply the 3x and the 4x first
then the 3x and the 9
then on the next line is the 5 and the 4x
then the 9 time the -5
then tally them up.
the ^2 means squared)

Answer 2

Hey. Im not sure what exactly do you want us to do.

1.(-4)(-11) I think that you have to mutiply and thats it. 4 x 11= 44 and -x- = +

2.(4x+9)(3x-5) Use the distributive property

4x * 9x + 9 *3x - 4x * 5 - 9 x 5

Remember that you multiply x by x and numbers by numbers, signs by signs

3.m2 - 81
m+9 m+9

I think that you perhaps wanted to write this:

m^2 - 81 = (m+9)(m-9)

4.factor 25x2y4 - 64x4y4 =

Use the same issue: (a + b)(a - b) = a^2 - b^2

25 x^2 y^4 = (5xy^2)^2

And 64x^4y^4 = (8 x^2y^2)^2


5. This must be a system of equation

2x - y= -1
x + y= 7....

You sum both equations and you obtain:

3x = 6 , hence x = 2

Then you plug x=2 in one of the equations and you find y

Hope this helps

Ana

Answer 3

1. you are multiplying two negative numbers... so two negatives make a postive... so you can just multiply (4)(11) because the two negatives cancel eachother out...

2. this is in the form (a + b)(c - d)... the way to figure this out is... ab + bc - ad - bd.... which would be... 12x(squared) + 7x - 45

3. sorry... not exactly sure what the problem is for this... if it is to factor m(squared) - 81, the answer would be (m+9)(m-9)... sorry...

4. need more information for this... is it 25x2y4 - 64x4y4 = 0? if so, you could find the square root of both nubmers... making it 5xy(squared) - 8x(squared)y(squared) = 0... then y(sq)(5x - 8x(sq)) = 0....

5. in this case you can make.... x = 7 - y , and then put that into the original equation... so 2(7- y) - y = -1 then... 14 - 3y = -1 ... 3y = 15 ... y = 5... put that into the equation to find x.... x + 5 = 7... x = 2

Answer 4

1. the two negatives make a positive then just multiply the numbers (44)

2. FOIL (( First multiply 4x and 3x ))(( Outside multiply 4x and -5 )) (( Inside 9 and 3x )) (( Last 9 and -5)) Finally: combine like terms!!

3. whats m?

4. pull out a 4 in the second part of the equation then???

5. solve for either y or x for either equation then plug into the equation you didnt solve for and solve for that variable then use that to find the other variable

Answer 5

1. (-4)(-11) = -4 X -11...the negatives cancel and you get 44.

2. remember FOIL? First, Outside, Inside, Last? multiply the first to terms, the two outside terms, the two inside terms, and the two last terms to expand. then combine like terms.
12x^2 - 20x + 27x - 45 --> 12x^2 + 7x - 45

3. factor this to (m-9)(m+9)

4. i'm not sure what you mean...is y4 = y^4?

5. this is a system of equations, so you just add them together...the y's cancel out so you're left with 3x = 6 --> x = 2. then you substitute x into one of the equations to find y.

hope this helps! i'm kind of bad at explaining

Answer 6

you to do add the both problems together like this: 2x - y = -1
+x + y = 7
This gets rid of the y and leaves you with 3x = 6. then solve for x which = 2. substitute that number into either problem like this: 2 + y = 7 and solve for the other variable. it is 5. so x = 2 and y =5

Answer 7

1) two negs. mulitplied together makes a postive #. So 4x11 = pos. 44.
2) You would use the foil method. 4x timees 3x + neg.5 times pos. 9 + 4x times neg. 5 + 9 times 3x. Add up all the like terms and you will get the answer.

For additional help on the rest of your questions, go to http://www.math.com

Answer 8

1. 44
2. 12x^2 +(-20x+27x) -45 = 12x^2 + 7x -45
3. m^2 - 72m +9
4. please clarify
5. y=2x-1, substitute y into the next equation and you get, x+2x-1=7, therefore 3x=6, divide each side by 3, and you get x=2. Next substitute, x =2 into either equation, lets do the second one again, 2+ y = 7. Therefore y=5.

Answer 9

On # 3 you could add like terms; the 81m+9m to get 90m. Then you would have m^2-90m+9. ( I assume your m2 means m squared.) You are not asked to factor the resulting trinominal so leave it as it is.

Answer 10

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