1.

Faotorisethe x2 +10 x+21

Answer»

ANSWER:

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



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