please help me solve these problems?

Question

8 - 5(4 - 3x) = 2(4 - x) - 8x
( a + 2) ( a^2 -3a + 7)
simplify : ( 3x^2 y) ( -2xy)^3
solve: square root of 4x - 2 = square root of 3x + 9
Is square root of x^2 - y^2 = x - y ?

Answer 1

1. 8 - 5(4 - 3x) = 2(4 - x) - 8x
8-20+15x =8 -2x-8x
25x = 20
x = 20/25 = 4/5

2.( a + 2) ( a^2 -3a + 7)
a^3 +2a^2 -3a^2 -6a +7a +14
a^3 -a^2 +a+14

3.simplify : ( 3x^2 y) ( -2xy)^3
(3x^2y) (-8x^3y^3)
-24 x^5y^4

4.square root of 4x - 2 = square root of 3x + 9
squaring both sides we get
4x-2 = 3x+9
x = 11

5.square root of x^2 - y^2 = x - y
No
square root of x^2 - y^2 = sq root of [(x+y)(x-y)]

Answer 2

8 - 5(4 - 3x) = 2(4 - x) - 8x
8 - 20 + 15x = 8 - 2x - 8x
-12 + 15x = 8 -10x
10x + 15x = 8 +12
25x = 20
x = 20/25 = 4/5

(a+2)(a^2-3a+7)
=a^3 - 3a^2 + 7a + 2a^2 - 6a + 14
=a^3 - a^2 + a + 14

(3x^2 y)(-2xy)^3
= 3(-2)^3 * x^5 * y^4
= -24 * x^5 * y^4

sqrt(4x-2) = sqrt(3x+9)
Square both sides
4x-2 = 3x+9
4x - 3x = 9 + 2
x = 11

sqrt(x^2-y^2) is not x -y.
Suppose that it is.
sqrt(x^2 - y^2) = x - y
square both sides
x^2 - y^2 = (x - y)^2
x^2 - y^2 = x^2 - 2xy + y^2
0 = 2y^2 - 2xy
0 = y(y-x)
Only true if y=0 or y=x.

Answer 3

8 - 5(4 - 3x) = 2(4 - x) - 8x
8-20+15x=8-2x -8x
15x+2x+8x = 8-8+20
25x = 20 --> x = 4/5

( a + 2) ( a^2 -3a + 7)
= a^3-3a^2 +7a +2a^2-6a+14
= a^3 -a^2 +a +14

simplify : ( 3x^2 y) ( -2xy)^3
= 3x^2y(-8x^3y^3 = -24x^5y^4

solve: square root of 4x - 2 = square root of 3x + 9
Square both sides getting
4x-2 = 3x+9
4x-3x = 9+2
x = 11

Is square root of x^2 - y^2 = x - y ?
No. x^2-y^2 = (x-y)(x+y)

Answer 4

take all the x to one side, and all the others to the other side:
a. 8 = 2(4-x) -8x +5(4-3x) => 8=8-2x-8x+20-15x => 8-8-20=-2x-8x-15x => -20 = -25x => x=20/25=4/5

b. no equation here...

c. no equation here as well...

d. the sq. roots are eliminated => 4x - 2 = 3x + 9 => 4x - 3x = 2 + 9 => x = 11

e. got to go, sorry

Answer 5

8-5(4-3x)=2(4-x)-8x
8 -20 +15x= 8-2x -8x
-12 +15x = 8 -10x
5x= 20
x= 4

sq rt. 4x-2 = sq rt. 3x+ 9
4x-2 = 3x+9
x = 11

Answer 6

8-20+15x=8-2x-8x
25x=20
x=4/5

a^3-3a^2+7a+2a^2-6a+14
a^3-a^2+a+14

-24xy^3 * x^2 *y

-9/11

no, just the square root of x^2 - y^2

Answer 7

i don't think finding the solution is the problem. Its understanding the way you wrote the question.. can you edit it so it'll be understandable. Just trying to understand what you mean already drained my brain, nothing left to discover a solution. is Rs a monetary symbol? What is the equivalent of paise to Rs? then are you asking... if you have Rs 100 (like $100) whats the most number of donkeys, horses and elephants can we buy, given that the cost of a donkey is 50 paise, a horse cost Rs 50 and an elephant cost Rs 10? (the money must all be spent)... OMG!! my nose bleeds.. LOL

Answer 8

like you expect me to answer this..... ask your math teacher....