Completing the square of 2x^2 - 8x + 7 = 0

First divide everything by 2:x² - 4x + 3.5 = 0Then divide number in front of the x by 2 and put it in a bracket squared + x. Then outside the bracket subtract the halved number squared. Keep the symbol the same, in this case the minus sign.(x-2)²-2²+ 3.5 = 0(x-2)² - 0.5 = 0(x-2)² = 0.5x - 2 = +/- square root 0.5 x = 2 +/- square root 0.5