Question

(a²+7b²)²
va rog
dau coroana ​

Answer 1

binom la patrat
a^4 + 14a^2b^2 +49b^4

Answer 2

$\green{ \huge \bf{formula:}}$

$\green{ \bf(a + b) {}^{2} = a {}^{2} + 2ab + {b}^{2} }$

$(a {}^{2} + 7b {}^{2} ) {}^{2} = \\ =( a {}^{2}) {}^{2} + 2a {}^{2} 7b { }^{2} + 7 {}^{2} (b {}^{2} ) {}^{2} = \\ = a {}^{4} + 14a {}^{2} b {}^{2} + 49b {}^{4}$