Question

Multiply (x + 1)(x + 3)

Answer 1

it's the answer ...

hope your day will be happy

and the last add 3x+x = 4x

Answer 2

x² + 4x + 3

Explanation:

(x + 1)(x + 3)

Each term in the second factor is multiplied by each term in the first factor, that is

x(x + 3) + 1 (x + 3) ← distribute parenthesis

= x² + 3x + x + 3 ← collect like terms

= x² + 4x + 3