Question

Factories the following:y square+4y-21

Answer 1

Step-by-step explanation:

y² + 4y - 21

y² + 7y - 3y - 21

y( y + 7) - 3( y + 7 )

(y-3)(y+7)

Answer 2

Step-by-step explanation:

use mid term spitting method...

y + 7y - 3 - 21

y(1+7)-3(1-7)

when you open the braket then the -sign of 3 and 7 becomes +

so answer= (y - 3) (1+7)