Question

Evaluate each expression for the given values of the variables
-5(x+2y)+15(x+2y); x=7 and y =-7
-k^2-(3k-5n)+4n; k=-1 and n=-2

Answer 1

\(\large {
-5({\color{brown}{ x}}+2{\color{blue}{ y}})+15({\color{brown}{ x}}+2{\color{blue}{ y}})\quad
\begin{cases}
{\color{brown}{ x}}=7\\
{\color{blue}{ y}}=-7
\end{cases}\implies \square ?
\\ \quad \\
-{\color{brown}{ k}}^2-(3{\color{brown}{ k}}-5{\color{blue}{ n}})+4{\color{blue}{ n}}\quad
\begin{cases}
{\color{brown}{ k}}=-1\\
{\color{blue}{ n}}=-2
\end{cases}\implies \square ?
}\)