4.Use the square root to solve the equation. a. x^2+49=0

Regroup like terms<br />${x}^{2}=0-49$ <br />Collect like terms<br />${x}^{2}=-49$ <br />Normalize the exponent of the item on the left<br />${x}^{2\times1}={x}^{2}=49^{1\times1}$ <br />Simplify<br />${x}^{2}=49$ <br />Take square roots of both sides<br />$x_1=7$ or $x_2=-7$ <br />