3x-4x^2+2x-7x^2+8=

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Solution for 3x-4x^2+2x-7x^2+8= equation:


Simplifying
3x + -4x2 + 2x + -7x2 + 8 = 0

Reorder the terms:
8 + 3x + 2x + -4x2 + -7x2 = 0

Combine like terms: 3x + 2x = 5x
8 + 5x + -4x2 + -7x2 = 0

Combine like terms: -4x2 + -7x2 = -11x2
8 + 5x + -11x2 = 0

Solving
8 + 5x + -11x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-11 the coefficient of the squared term: 

Divide each side by '-11'.
-0.7272727273 + -0.4545454545x + x2 = 0

Move the constant term to the right:

Add '0.7272727273' to each side of the equation.
-0.7272727273 + -0.4545454545x + 0.7272727273 + x2 = 0 + 0.7272727273

Reorder the terms:
-0.7272727273 + 0.7272727273 + -0.4545454545x + x2 = 0 + 0.7272727273

Combine like terms: -0.7272727273 + 0.7272727273 = 0.0000000000
0.0000000000 + -0.4545454545x + x2 = 0 + 0.7272727273
-0.4545454545x + x2 = 0 + 0.7272727273

Combine like terms: 0 + 0.7272727273 = 0.7272727273
-0.4545454545x + x2 = 0.7272727273

The x term is -0.4545454545x.  Take half its coefficient (-0.2272727273).
Square it (0.05165289257) and add it to both sides.

Add '0.05165289257' to each side of the equation.
-0.4545454545x + 0.05165289257 + x2 = 0.7272727273 + 0.05165289257

Reorder the terms:
0.05165289257 + -0.4545454545x + x2 = 0.7272727273 + 0.05165289257

Combine like terms: 0.7272727273 + 0.05165289257 = 0.77892561987
0.05165289257 + -0.4545454545x + x2 = 0.77892561987

Factor a perfect square on the left side:
(x + -0.2272727273)(x + -0.2272727273) = 0.77892561987

Calculate the square root of the right side: 0.882567629

Break this problem into two subproblems by setting 
(x + -0.2272727273) equal to 0.882567629 and -0.882567629.

Subproblem 1

x + -0.2272727273 = 0.882567629 Simplifying x + -0.2272727273 = 0.882567629 Reorder the terms: -0.2272727273 + x = 0.882567629 Solving -0.2272727273 + x = 0.882567629 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2272727273' to each side of the equation. -0.2272727273 + 0.2272727273 + x = 0.882567629 + 0.2272727273 Combine like terms: -0.2272727273 + 0.2272727273 = 0.0000000000 0.0000000000 + x = 0.882567629 + 0.2272727273 x = 0.882567629 + 0.2272727273 Combine like terms: 0.882567629 + 0.2272727273 = 1.1098403563 x = 1.1098403563 Simplifying x = 1.1098403563

Subproblem 2

x + -0.2272727273 = -0.882567629 Simplifying x + -0.2272727273 = -0.882567629 Reorder the terms: -0.2272727273 + x = -0.882567629 Solving -0.2272727273 + x = -0.882567629 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2272727273' to each side of the equation. -0.2272727273 + 0.2272727273 + x = -0.882567629 + 0.2272727273 Combine like terms: -0.2272727273 + 0.2272727273 = 0.0000000000 0.0000000000 + x = -0.882567629 + 0.2272727273 x = -0.882567629 + 0.2272727273 Combine like terms: -0.882567629 + 0.2272727273 = -0.6552949017 x = -0.6552949017 Simplifying x = -0.6552949017

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1098403563, -0.6552949017}

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