Question

Evaluate the expression. $$4 a+a^{2} \text { when } a=-7$$

Short answer

The value of the expression when \(a = -7\) is \(21\).

Step-by-step solution

Substitution of the value of 'a'

We are given that \(a = -7\). Substitute this value into the given expression \(4a + a^2\). This gives us \(4(-7) + (-7)^2\).

Simplify the expression

Calculate the individual parts of the formula. The result is \(-28 + 49\).

Final Calculation

The final step is to add the two numbers together, which gives the answer \(21\).