What is 10

What is the measure of the square side whose area is (4x² + 28x+49) square units?

Result

a = (Correct answer is: 2x+7)

Step-by-step explanation:

$$\begin{gathered} S=4x^2+28x+49 \\ S=a^2 \\ S=(2x+7{)}^2 \\ a=2x+7 \end{gathered}$$

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