Question

Evaluate
using suitable identity solve.
（x+3）（x+7）

Answer 1

Answer:

x(x+7) +3(x+7)

x^2+7x+3x+21

x^2+10x+21

Answer 2

Answer:

(x+a)(x+b) = x²+(a+b)x+ab

= x²+(3+7)x+3×7

= x²+10x+21

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