Rewrite the left hand side as a perfect square trinomial, then take the square root of each side.
3.1 and 10.9
Practice makes perfect
To solve a quadratic equation in the form x^2=n, take the square root of each side. For any number n≥ 0, if x^2=n, then x=±sqrt(n). Keeping this in mind, let's consider the given equation.
Both x=7-sqrt(15), and x=7+sqrt(15) are solutions of the equation. Let's use a calculator to approximate our solutions. We see that rounded values are x=3.1, and x=10.9.
