Question

Evaluate the expression r^3 + 4r^2s for r = – 2 and s = 3.What is the solution?

Answer 1

Consider the given expression,

`r^3\cdot4r^2s`

It is given that,

`\begin{gathered} r=-2 \\ s=3 \end{gathered}`

Substitute the values in the expression,

`\begin{gathered} =(-2)^3\cdot4(-2)^2(3) \\ =(-8)\cdot4(4)(3) \\ =(-8)\cdot(48) \\ =-384 \end{gathered}`

Thus, the value of the expression at the given values, is -384.