Question

$(7 + 8) {}^{2} (7 - 8) {}^{2}$
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Answer 1

Step-by-step explanation:

= (7+8)*2 (7-8)*2

= (a+b)*2 (a-b)*2

= (a*2 ) - (b*2)

= (7*2) - (8*2)

= 49 - 64

= -15

Answer 2

Using the formula a^2-b^2=(a+b)(a-b),
(7+8+7-8)(7+8-7+8)=(14)(16)=224