4x^2-31x+72=0

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Solution for 4x^2-31x+72=0 equation:


Simplifying
4x2 + -31x + 72 = 0

Reorder the terms:
72 + -31x + 4x2 = 0

Solving
72 + -31x + 4x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
18 + -7.75x + x2 = 0

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + -7.75x + -18 + x2 = 0 + -18

Reorder the terms:
18 + -18 + -7.75x + x2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -7.75x + x2 = 0 + -18
-7.75x + x2 = 0 + -18

Combine like terms: 0 + -18 = -18
-7.75x + x2 = -18

The x term is -7.75x.  Take half its coefficient (-3.875).
Square it (15.015625) and add it to both sides.

Add '15.015625' to each side of the equation.
-7.75x + 15.015625 + x2 = -18 + 15.015625

Reorder the terms:
15.015625 + -7.75x + x2 = -18 + 15.015625

Combine like terms: -18 + 15.015625 = -2.984375
15.015625 + -7.75x + x2 = -2.984375

Factor a perfect square on the left side:
(x + -3.875)(x + -3.875) = -2.984375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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