Question

Вычисли:
$(7 - 9) {}^{2} + (9 - 7) {}^{2} - ( - 3 + ( - 2)) {}^{2} + {3}^{2} - {2}^{2}$
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Answer 1

$\displaystyle \tt (7-9)^2+(9-7)^2-(-3+(-2))^2+3^2-2^2=\\\\ \displaystyle \tt =(-2)^2+2^2-(-5)^2+9-4=4+4-25+5=8-20=\bold{-12}$

ОТВЕТ: $\displaystyle \tt -12$