Question

(4a³- 7a²b-2c) (-3ax⁴)​

Answer 1

$\left(4a^3-7a^2b-2c\right)\left(-3ax^4\right):\quad -12a^4x^4+21a^3bx^4+6acx^4$

$=\left(-3ax^4\right)\cdot \:4a^3+\left(-3ax^4\right)\left(-7a^2b\right)+\left(-3ax^4\right)\left(-2c\right)$

$=4a^3\left(-3ax^4\right)-7a^2b\left(-3ax^4\right)-2c\left(-3ax^4\right)$

$=-12a^4x^4+21a^3bx^4+6acx^4$