Question

(7a-3)²=
(9a-7b)²=
(4a+5b)²​

Answer 1

Respuesta:

(7a-3)²=49a²+9-42a

(9a-7b)²=81a²+49b²-126ab

(4a+5b)²=16a²+25b²+40ab

Explicación paso a paso:

(7a-3)²=(7a)²+3²-2×7a×3=49a²+9-42a

(9a-7b)²=(9a)²+(7b)²-2×9a×7b=81a²+49b²-126ab

(4a+5b)²=(4a)²+(5b)²+2×4a×5b=16a²+25b²+40ab