Question

find the expand(x+1)(x+3)
$(x + 1)(x + 3)$
​

Answer 1

We know, (x + a)(x + b) = x2 + (a + b)x + ab.

Therefore,

(x+1) (x+3)

= x^2 + (1 + 3)x + (1 × 3)

= x^2 + 4x + 3 (ans.)