Question

What are the steps to find out the solution of (-7²+3²) by using the formula (a²+b²).

Answer 1

Answer:

There is no such identity (a^2+b^2).

Do you mean:

$(a+b) ^2$$=a^2+b^2+2ab$

So, there is no identity that can be used here.

Answer 2

$a {}^{2} + 2ab + b {}^{2} = - ( 7 ){}^{2} + 2 \times (- 7) \times 3 {}^{2} + 3 {}^{2} = 49 + (- 14) \times 9 + 9 = 49 - 14 \times 9 + 9 = 49 - 126 + 9 = 58 - 126 = - 68$

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