Question

Can someone help me please ??

Answer 1

Answer:

$-2a^2-2a+11$  

Step-by-step 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 $-2a^2-2a+11$.