Question

18. Factorise y² + 2y - 15.​

Answer 1

y² + 2y - 15 = 0

y² + 5y - 3y - 15 = 0

y(y + 5) - 3(y + 5) = 0

(y + 5) (y - 3) = 0

taking (y + 5) = 0 => y = -5

now taking (y - 3) = 0 => y = 3

So, the required factors of the given equation are -5 and 3

Hope it helps...

Answer 2

In this exercise we have to factor the equation given in the statement, so we have to:

The factors of the given equation are -5 and 3.

So from the given equation we have that:

$y^2 + 2y - 15 = 0\\y^2 + 5y - 3y - 15 = 0\\y(y + 5) - 3(y + 5) = 0\\(y + 5) (y - 3) = 0$

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