Step-by-step explanation:
(x+a)(x+b)=x^2+x (a+b)+ab
=a^2+a (7+-3)+(7×-3)
=a^2+4a-21
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Step-by-step explanation:
(x+a)(x+b)=x^2+x (a+b)+ab
=a^2+a (7+-3)+(7×-3)
=a^2+4a-21