Question

Find the value of each expression below when a = 3, and b = 43b - a?2b power 2 – 7a

Answer 1

Given that a = 3, b = 4

To solve:

`\begin{gathered} A)\text{ 3b-a}^2 \\ B)\text{ 2b}^2-7a \end{gathered}`

To solve, we substitute the values of a and b into the given expressions.

Thus,

A)

`\begin{gathered} 3b-a^2=3(4)-(3)^2 \\ =12-9 \\ =3 \end{gathered}`

B)

`\begin{gathered} 2b^2-7a=2(4)^2-7(3) \\ =32-21 \\ =11 \end{gathered}`