Question

a) (x² + 12x-9) (8x²+7x-1)=

Answer 1

Resposta:

a) (x² + 12x-9) (8x²+7x-1)=

x²(8x²+7x-1) +12(8x²+7x-1) -9(8x²+7x-1)

= 8x⁴ + 7x³ - x² + 96x² + 84x - 12 - 72x² - 63x + 9

= 8x⁴ + 7x³ - x²+96x²-72x² +84x-63x -12+9

= 8x⁴ + 7x³ + 23x² + 21x - 3