Question

factor y^2+7y-18

Answer 1

y^2+7y-18
=y^2+9y-2y-18
=y(y+9)-2(y+9)
=(y+9)(y-2)

Answer 2

You can do this by grouping but much faster just to just find the factors of -18 that has a sum of + 7 and then just
(y+ n)(y - n)

Here we have factor of -18 = +9 * 2
Sum is +7

plug in the number into (y+ n)(y + n)
(y+ 9)(y - 2)

Answer 3

Made a boo boo

You can do this by grouping but much faster just to just find the factors of -18 that has a sum of + 7 and then just
(y+ n)(y - n)

Here we have factor of -18 = +9 * -2
Sum is +7

plug in the number into (y+ n)(y - n)
(y+ 9)(y - 2)

Answer 4

okay thank you !