multiplying negative numbers?

Question

How would you evaluate 3a + 5, for a = -5? I don't know how to multiply negative numbers.
If you don't show how to evaluate don't bother asking cause I need to know how to do it!

Answer 1

just do 3x5 and add a negative sign in front of it

Answer 2

3a + 5 is equivalent to 3 times 'a' plus 5.

A positive number times a negative number yields a negative number as in 3 x -2 = -6.

Two negative numbers multiplied together yield a positive number as in -3 x -2 = 6.

Finally, two positive numbers multiplied together yield a positive as in 3 x 2 =6.

This should give you all the information you need. Just substitute -5 for 'a' and multiply by 3 and the rest should be obvious.

One more hint -10 + 5 = -5 not -15, remember that opposites cancel in addition as in -3 + 3 = 0.

Answer 3

basically a moron could assert "it rather is often mentioned" whilst it needless to say isn't. I word which you declare that multiplying 2 numbers is the comparable as including them. It needless to say isn't. the place does including 3.7 are available in, interior the multiplication of two.33 x 3.7 ? wow, are you clueless. 2 circumstances 3 is comparable to 3+3. interior the addition tutor me the two? you in addition to mght declare that "It additionally works for multiplying negatives and positives:" after which you supply an occasion -2 x 3 = -2 + (-2) + (-2) So, tutor me the thank you to do 2 x (-3) ...what's the which potential of including a variety damaging three times? Do you think of damaging 3 apples has life? How approximately damaging 3 inches? -=-=- and the form you get -2 x -3 = -2-(-2)-(-2)-(-2)-(-2) is in simple terms strange. have you ever had your drugs in the present day? -=-=- It does artwork the comparable way. Its in simple terms that YOUR way is faulty. A x B = (|A|+|B|)(sign(A)*sign(B)) the place | | potential genuinely the or effective value and sign(A) is defined as -a million if A < 0 in any different case it rather is +a million and +a million x (+a million) = +a million, -a million x (-a million) = +a million, +a million x (-a million) = -a million, -a million x (+a million) = -a million, and -a million x A = -A +1x A = +A = A

Answer 4

If you multiply a negative number, the whole number becomes negative. So for that equation then, 3(-5)= -15 and -15+5= -10

Answer 5

3a + 5, for a = -5 ->
3(-5) + 5 =
-15 + 5 =
-10

When multiplying a negative number by a positive, it makes the result negative. When multiplying a negative by a negative, it makes a postive.

Good luck!

Answer 6

3 x (-5) + 5 = -15 + 5 = -10

Answer 7

when you multiply a negative to a positive the answer is negative, but when you multiply a negative to a negative, the answer is positive ( - x - = + and - x + = -) So since 3 is positive, and 5 is negative (positive times negative) the answer would be the same as 3x5, but negative. Do the multiplication first, then add your positive 5.

Answer 8

First, you need to know the rules of signs:

(+1)(+1) = +1 = 1

(+1)(-1) = -1

(-1)(+1) = -1

(-1)(-1) = +1 = 1

(+1 ) / (+1) = 1 / 1 = +1 = 1

(+1 ) / (-1) = (1) / (-1) = -1

(-1 ) / (+1) = (-1) / 1 = -1

(-1 ) / (-1) = +1 = 1

Now: (a)(+1) = (+a)(+1) = +a = a

(a)(-1) = (+a)(-1) = -a

(-a)(+1) = (-a)(1) = -a

(-a)(-1) = +a = a

And: (a)(b) = (+a)(+b) = +ab = ab

(a)(-b) = (+a)(-b) = -ab

(-a)(b) = (-a)(+b) = -ab

(-a)(-b) = +ab = ab

If a = -5 and b = 3

(3)(-5) = (+3)(-5) = -15

(3)(a) = 3a = -15

-15 + 5 = (-15) + (+5) = -15 + 5 = -10

Answer 9

When you multiply an negative number by a postive number, you get a negative answer (product). For example -9 x 8= -72


When you multiply a negative number by another negative number, you get a positive answer (product).
For example, -12 x - 12= 144

Answer 10

negative x negative = positive
negative x positive = negative.

So to answer the problem where a = -5

3(-5) + 5
-15 + 5
answer is -10

Answer 11

3(-5) + 5
-15 + 5
answer is -10
negative x negative=positive
negative x positive=negative
negative + positive u have to substract and the sign is from the bigest number
negative + negative is positive