Question

Prove the formula a + b whole square is e is identical equals to a square + 2 a b + b square by the number - 7 + - 5 whole square is equals to minus 7 square + 2 into minus 7 into minus 5 + - 5 whole square​

Answer 1

Answer:

${( - 7 + ( - 5))}^{2} \\ a = - 7 \\ b = - 5 \\ 2ab = 2( - 7)( - 5) = 70 \\ {( - 7 + ( - 5))}^{2} = {( - 7)}^{2} + {( - 5)}^{2} + 2( - 7)( - 5) \\ {( - 7 - 5)}^{2} = 49 + 25 + 70 \\ {( - 12)}^{2} = 74 + 70 \\ 144 = 144 \\ hence \: proved$