How do you find the product (y+4)(y-8)?

2 Answers
Dec 1, 2016

y=-4 or 8

Explanation:

(y+4)(y-8)

y^2-8y+4y-32

This is a quadratic equation (because of the power of 2), so we will have to use the quadratic formula which is:

ax+by+c=0

So

y^2-4y-32 = 0

So basically, now we know the quadratic equation, we can say:

(y+4)(y-8) = 0

Possible Answers are:

y=-4

y=8

because if one or the other equals to 0, then multiplying it with any number makes it 0.

Dec 1, 2016

The question only askes for the product which is:

y^2-4y-32

Explanation:

color(blue)((y+4))color(green)((y-8))

Multiply everything in the right hand side bracket by everything in the left one.

color(blue)(ycolor(green)((y-8))" "+" "4color(green)((y-8))

y^2-8y" "+" "4y-32

y^2-4y-32