-4x^2+19x=30

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Solution for -4x^2+19x=30 equation:


Simplifying
-4x2 + 19x = 30

Reorder the terms:
19x + -4x2 = 30

Solving
19x + -4x2 = 30

Solving for variable 'x'.

Reorder the terms:
-30 + 19x + -4x2 = 30 + -30

Combine like terms: 30 + -30 = 0
-30 + 19x + -4x2 = 0

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

Divide each side by '-4'.
7.5 + -4.75x + x2 = 0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + -4.75x + -7.5 + x2 = 0 + -7.5

Reorder the terms:
7.5 + -7.5 + -4.75x + x2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -4.75x + x2 = 0 + -7.5
-4.75x + x2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
-4.75x + x2 = -7.5

The x term is -4.75x.  Take half its coefficient (-2.375).
Square it (5.640625) and add it to both sides.

Add '5.640625' to each side of the equation.
-4.75x + 5.640625 + x2 = -7.5 + 5.640625

Reorder the terms:
5.640625 + -4.75x + x2 = -7.5 + 5.640625

Combine like terms: -7.5 + 5.640625 = -1.859375
5.640625 + -4.75x + x2 = -1.859375

Factor a perfect square on the left side:
(x + -2.375)(x + -2.375) = -1.859375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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