Question

Is (4a+5b)² = (4a)²+(5b)²

Answer 1

yes...

(4a+5b)² = (4a)²+(5b)²
⬇️
(if bracket is removed)

(4a)²+(5b)²=(4a)²+(5b)²



hope helps

Answer 2

no it is in correct.

$(4a + 5b) {}^{2} = (4a) {}^{2} + 2(4)(5)ab + (5b) {}^{2}$