SOLUTION: complete the square x^2+20x=30 x= ? and ?

Question 87888: complete the square
x^2+20x=30
x= ? and ?
Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!

Assuming that the coefficient of is 1, you must take HALF of the x coefficient and SQUARE it, adding this quantity to each side of the equation as follows:
Half of 20 is 10, and 10^2= 100!

Take the square root of each side:

Subtract 10 from each side:

R^2 Retired from SCC

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