Question

find the square of 3a+7b​

Answer 1

the square of (3a+7b)²
9a+49b +42ab

Hope it's help

Answer 2

$3a + 7b \\ (3a + 7b)^{2} \\ (3a) {}^{2} + (7b) {}^{2} + 2 \times 3a \times 7b \\ = \geqslant 9a {}^{2} + 49b {}^{2} + 42ab \: \\ \: \: \: \: \: \: \: \: \: \: \: < answer \: by \: \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: akshat \: rajput\geqslant$