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

asked May 14, 2021 122k views

5 votes

Nhich expression is the factorization of x2 + 10x + 21?

(X+3)(x + 7)
(X + 4)(X+6)
(X+6)(X + 15)
(X+ 7)(X + 14)

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2 votes

Answer:

${x}^(2) + 10x + 21 \\ {x}^(2) + 7x + 3x + 21 \\ x(x + 7) + 3(x + 7) \\ = (x + 3)(x +7 )$

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