Question

Can somebody help with 87-88?

Answer 1

87: 10x^2 - 16x - 42

88: 4y^2 - 38y - 20

Explanation:

87:

First we distribute (2x-6) to (5x+7)

We can multiply 2x by 5x and 7

this gives us 10x^2 + 14x

We then have to distribute the -6 to (5x+7)

this gives us -30x - 42

we combine the two sets of terms:

10x^2 +14x - 30x - 42

Then we combine like terms

10x^2 - 16x -42

88:

We do the same thing we did in question 87

First, distribute y to (4y+2)

this gives us 4y^2 +2y

Then we have to distribute the remaining -10 to (4y+2)

this gives us -40y - 20

combine the sets of terms:

4y^2 + 2y - 40y -20

Then combine like terms

4y^2 - 38y - 20 is your finial answer