Question

Use the distributive property to expand the expression. 5x2 − (6x − 4y) + 9z

Answer 1

5x² − 6x + 4y + 9 z

Explanation:

5x^2 −1(6x − 4y) + 9z

You see the -1 in front of (6x-4y) that is actually there, it is just disguised as a - sign. When you take away the ()'s you must distribute this negative one to 6x and -4y.

-1 * 6x = -6x

-1 * -4y = 4y

so now we have 5x² - 6x + 4y + 9z*

*the + in front of 9z need not be changed we are only changing the stuff inside the ()'s

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Answer 2

You start with the parenthesis so ou have to distribute the minus.
It gives you 5x2 - 6x + 4y + 9z
Then you can do the first multiplication (I’m assuming it’s not the letter x by the 5)
So you end up with 10 - 6x + 4y + 9z
Hope that helps :)