Question

Which expression is the factorization of x2 + 10x + 21?
(x + 3)(x + 7)
(x + 4)(x+6)
O (X+6)(x + 15)
O (x + 7)(x + 14)
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Answer 1

(x + 3)(x + 7)

Multiply the two brackets together

x•x+7•x+3•x+3•7

x^2+7x+3x+21

x^2+10x+21

Answer:( x + 3)(x + 7)