Question

me ajudem por favor ​

Answer 1

Resposta:

a) $9x^4-4c^2$

b) $a^4b^4-6{,}25c^2$

Explicação passo a passo:

a) $\left(3x^2-2c\right)\left(3x^2+2c\right)$

$=\left(3x^2\right)^2-\left(2c\right)^2$

$=9x^4-4c^2$

b) $\left(a^2b^2+2{,}5c\right)\left(a^2b^2-2{,}5c\right)$

$=\left(a^2b^2\right)^2-\left(2{,}5c\right)^2$

$=a^4b^4-6{,}25c^2$