Question

Can someone help me please ??

Answer 1

`-2a^2-2a+11`

Explanation:

To solve the question, use the given values of the variables and substitute them into the given expression.

We know that
`C = 2a^2-5` and
`D = 3-a`. With these values, we need to find
`2D-C`. So, substitute
`2a^2-5` for the
`C` and
`3-a` for the
`D` in that expression. Then, solve:

`2D-C\\\\= 2(3-a)-(2a^2-5)\\= 6-2a-2a^2+5\\= -2a^2-2a+11`

Thus,
`2D-C` equals
`-2a^2-2a+11`.