Question

Se A=5x²–2 , determine o valor de A²–3A–1​

Answer 1

$a = 5 {x}^{2} - 2$

${a}^{2} - 3a - 1 = n$

$(5 {x}^{2} - 2).(5 {x}^{2} - 2) - 3(5 {x}^{2} - 2) - 1 = n$

$25 {x}^{4} - 10 {x}^{2} - 10 {x}^{2} + 4 - 15 {x}^{2} + 6 - 1 = n$

$25 {x}^{2} - 20 {x}^{2} + 4 - 15 {x}^{2} + 6 - 1 = n$

$25 {x}^{4} - 35 {x}^{2} + 9 = n$

Espero ter ajudado