Would you mind helping me ?

Question

so if u have to simplify 7(2x+2) - 9(-1+6x)

when i distribute would i use 9 or -9

Answer 1

I would distribute the -9, and add.

(7*2x + 7*2) + ((-9)*(-1) + (-9)*6x)

14x + 14 + 9 - 54x

23 - 40x

Answer 2

-9

U could do it either way

14x + 14 - (-9+54x) and then remove the parens or just use -9 to begin with.

14x + 14 + 9 -54x

Answer 3

-9(-1 + 6x) = (-9)(-1) + (-9)(+6x) = 9 - 54x

Answer 4

You should distribute -9 into -1 and 6x.  Be careful when multiplying negative numbers!

The answer is:

-40x+23 or 23-40x

Answer 5

-9, it really isnt a subtraction sign after you do all of the simplifying then you just combine like terms

Answer 6

You would use -9 and it affects all terms within the parentheses.

Answer 7

Either read it as:

- (9(-1 + 6x)) = - (-9 +54x) = 9 - 54x

or

-9(-1 + 6x) = 9 - 54x

you still get the same answer, so...

7(2x + 2) - 9(-1 + 6x) = 14x + 14 + 9 - 54x = 23 - 40x

Answer 8

Remember this rule:

When distributing to something in parenthesis always use the number and the sign before it. if there isnt a sign then it is a positive.