Question

expand (a-7) (a+7) with the help of identities

Answer 1

Answer:

To expand a bracket means to multiply each term in the bracket by the expression outside the bracket. For example, in the expression 3 ( m + 7 ) , multiply both. 3 ( m + 7 ) = 3 × m + 3 × 7 = 3 m + 21 .

Answer 2

Answer:

(a-7)(a+7)=a²-7²

identity:-

a²-b²=(a+b)(a-b)

(a-7)(a+7)=a²-7²

Step-by-step explanation:

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