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Sindrei [870]
3 years ago
13

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

Mathematics
2 answers:
vitfil [10]3 years ago
8 0

Answer:

A: (x + 3)(x + 7)

Step-by-step explanation:

Vadim26 [7]3 years ago
5 0

Answer: First option.

Step-by-step explanation:

You need to remember that to factorize the given expression x^2+10x+21, you need to choose two numbers that when you add them you get "10" and when you multiply them you get "21".

These number are:

7 and 3

Because:

7+3=10\\7*3=21

Therefore, you get that the factorization of the expression x^2+10x+21 is the following:

(x+3)(x+7)

You can observe that this factorization matches with the first option.

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