Question

Multiply: (x+3) (x + 7)​

Answer 1

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

I hope this will help you.