How do you...
2 years ago
Experienced Maths tutor, infectiously enthusiastic
Once you have completed the square you have an equation in the form (x-a)^2 = b
You can solve for x by taking the square root of both sides* to get x-a = sqroot(b) or x-a = -sqroot(b)
Then rearrange by adding a to both sides to get two possible values for x.
*remember to use both the positive and the negative square root so that you still get two values of x
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