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what expression is the factorization of x^2+10x+21
a: (x+3)(x+7)
b: (x+4)(x+6)
c: (x+6)(x+15)
d: (x+7)(x+14)

Sagot :

Answer:

(x+3)(x+7)

Step-by-step explanation:

3+7 = 10 (the middle number)

3(7) = 21 (the third number)

Chloecistxidn

Answer:

a

Step-by-step explanation:

FOIL

f-first

o-outer

i-inner

l-last

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