Explanation: To get the solution, we will need to isolate the x on one side of the equation as follows: 10x² - 56 = 88 - 6x² 10x² - 56 + 56 = 88 - 6x² + 56 10x² = 144 - 6x² 10x² + 6x² = 144 - 6x² + 6x² 16x² = 144 x² = 144/16 x² = 9 x = ±√9 either x = +√9 = 3 or x = -√9 = -3
