Question

Find the factors of 2y² - 4y - 30.

Answer 1

2y² - 4y - 30

= 2(y² - 2y - 15)      .....(taking out the common factor 2)

= 2(y² - 5y + 3y - 15) 

= 2[y(y - 5) + 3(y - 5)]

= 2(y - 5)(y + 3).