Question

multiply :

1. (12x² - 4x + 5) by 8x³
2. (3a³x³ - 4ay² + 7a²y) by - 4x²ya²

answers by solving...

irrevelent answers will be reported​

Answer 1

$\left(12x^2-4x+5\right)\cdot \:8x^3$

$=8x^3\left(12x^2-4x+5\right)$

$=8\cdot \:12x^3x^2-8\cdot \:4x^3x+8\cdot \:5x^3$

$=96x^5-32x^4+40x^3$

$\left(3a^3x^3-4ay^2+7a^2y\right)\left(-4\right)x^2ya^2$

$=\left(-4\right)y\left(-4ay^2+7a^2y+3a^3x^3\right)\left(ax\right)^2$

$=-\left(3a^3x^3-4ay^2+7a^2y\right)\cdot \:4\left(xa\right)^2y$

$=-4a^2x^2y\left(-4ay^2+7a^2y+3a^3x^3\right)$