150
Explanation:
The given expression: -a²+7b⁴-2c³
if a= -4
b= -2
c= -3
= -(-4)² + 7(-2)⁴ - 2(-3)³
[tex]\begin{gathered} -(-4\times-4)+\text{ 7(-2}\times-2\times-2\times-2)-\text{ 2(-3}\times-3\times-3) \\ =\text{ -(16) + 7(16) -2(-27)} \\ =\text{ -16 + 112 + 54} \\ =\text{ 150} \end{gathered}[/tex]-a²+7b⁴-2c³ = 150
