4x+5x^2=8x-7

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Solution for 4x+5x^2=8x-7 equation:


Simplifying
4x + 5x2 = 8x + -7

Reorder the terms:
4x + 5x2 = -7 + 8x

Solving
4x + 5x2 = -7 + 8x

Solving for variable 'x'.

Reorder the terms:
7 + 4x + -8x + 5x2 = -7 + 8x + 7 + -8x

Combine like terms: 4x + -8x = -4x
7 + -4x + 5x2 = -7 + 8x + 7 + -8x

Reorder the terms:
7 + -4x + 5x2 = -7 + 7 + 8x + -8x

Combine like terms: -7 + 7 = 0
7 + -4x + 5x2 = 0 + 8x + -8x
7 + -4x + 5x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
7 + -4x + 5x2 = 0

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

Divide each side by '5'.
1.4 + -0.8x + x2 = 0

Move the constant term to the right:

Add '-1.4' to each side of the equation.
1.4 + -0.8x + -1.4 + x2 = 0 + -1.4

Reorder the terms:
1.4 + -1.4 + -0.8x + x2 = 0 + -1.4

Combine like terms: 1.4 + -1.4 = 0.0
0.0 + -0.8x + x2 = 0 + -1.4
-0.8x + x2 = 0 + -1.4

Combine like terms: 0 + -1.4 = -1.4
-0.8x + x2 = -1.4

The x term is -0.8x.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8x + 0.16 + x2 = -1.4 + 0.16

Reorder the terms:
0.16 + -0.8x + x2 = -1.4 + 0.16

Combine like terms: -1.4 + 0.16 = -1.24
0.16 + -0.8x + x2 = -1.24

Factor a perfect square on the left side:
(x + -0.4)(x + -0.4) = -1.24

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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