Question

Factorize : y² - 8y -15​

Answer 1

${y}^{2} - 8y + 15 = 0 \\ = > {y}^{2} - 3y - 5y + 15 = 0 \\ = > y(y - 3) - 5(y - 3) = 0 \\ = > (y - 5)(y - 3) = 0 \\ so \: \\ y - 5 = 0 \: \: \: \: \: \: \: \: or \: \: \: \: \: \: y - 3 = 0 \\ = > y = 5 \: \: \: \: \: \: \: \: \: \: \: = > y = 3$

Answer 2

Answer:

y2-8y-15

y2-3y+5y-15

y(y-3)+5(y-3)

(y-3)(y+5)