Question

Expand: (5a^2 - 7b^2)^2​

Answer 1

$(5a^2 - 7b^2)^2$

${25a}^{4} - 2 \times 5 {a}^{2} \times 7 {b}^{2} + 49 {b}^{4}$

$25 {a}^{4} - 70 {a}^{2} {b}^{2} + 49 {b}^{4}$

Answer 2

Step-by-step explanation:

$(5a {}^{2} - 7b {}^{2} ) {}^{2}$

$= > (5a {}^{2} + 7b {}^{2} )(5a {}^{2} - 7b {}^{2} )$