Question

(y-6)²=
(4ab-7)²=
(10xy+9a)²
Ajudem por favor!!!

Answer 1

$a) (y-6)^{2} = y^{2} - 2 \cdot y \cdot 6 + 6^{2} = y^{2} - 12 y + 36$


$b) (4ab - 7 )^{2} = (4ab)^{2} -2 \cdot 4ab \cdot 7 + 7^{2} = 16 a^{2} b^{2} -56ab + 49$


$c) (10xy+9a)^{2} = (10xy)^{2} + 2 \cdot 10xy \cdot 9a + (9a)^{2} =$

$100 x^{2} y^{2} + 180xya + 81 a^{2}$

Espero ter te ajudado!