Question

find the product using suitable identities (a+7)(a-3)
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Answer 1

Answer:

˙❥˙ Answer

$(a + 7)(a - 3) \\ \\ = {a}^{2} - 3a + 7a - 21 \\ \\ = {a}^{2} + 4a - 21$

Answer 2

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