Question

factorise by using factor theoram y^2-2y-8​

Answer 1

Step-by-step explanation:

Consider the form x2+bx+cx2+bx+c. Find a pair of integerswhose product is cc and whose sum is bb. In this case, whose product is −8-8 and whose sum is −2-2.

−4,2

Answer 2

$y ^{2} - 2y - 8 \\ \\ y ^{2} + 2y - 4y - 8 \\ \\ y(y + 2) - 4(y + 2) \\ \\ (y + 2)(y - 4) \\ \\ y = - 2 \: \: y = 4$