6x² + 1 = 13
isolate the x, subtract 1 from both sides
6x² + 1 (-1) = 13 (-1)
6x² = 13 - 1
6x² = 12
divide 6 from both sides to isolate the x
6x²/6 = 12/6
x² = 12/6
x² = 2
isolate the x, root both sides to get rid of the square
√x² = √2
x = √2
x = √2 is your answer
hope this helps