Question

I dont understand how the expression can be expand, can someone tell me step by step (y + 1)(y - 3)

= y(y - 3) + 1(y - 3)
= y2 – 3y + y - 3
= y2 – 2y - 3​

Answer 1

Explanation:

(y + 1)(y - 3)

= y(y) -3(y) +1(y) -3(1)

= y^2 - 3y + y - 3

= y^2 - 2y - 3

Answer 2

You use foil have to use the foil method