Question

Вычислите:
87^2+87*26+13^2

Answer 1

$a^2+2ab+b^2=(a+b)^2$
$87^2+87*26+13^2=87^2+2*87*13+13^2=(87+13)^2=100^2=$$10000$

Answer 2

$87 ^{2} +87*26+13 ^{2} =87 ^{2} +87*2*13+13 ^{2} =(87+13) ^{2} = \\ =100 ^{2} =10000 \\ \\ A)10000$