Which expression is the factorization of x^2 + 10x + 21?

Question

asked May 19, 2021 180k views

2 Answers

Diomidis Spinellis · Answer 1 · 2021-05-22T02:35:24+0000

Answer:

(x + 3)(x + 7).

Explanation:

x^2 + 10x + 21.

You need 2 numbers whose product is the last number in the function (+21) and whose sum is the coefficient of x (+10).

These are + 3 and + 7, so the factors are:

(x + 3)(x + 7).