0=-6x^2+5x+7

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Solution for 0=-6x^2+5x+7 equation:


Simplifying
0 = -6x2 + 5x + 7

Reorder the terms:
0 = 7 + 5x + -6x2

Solving
0 = 7 + 5x + -6x2

Solving for variable 'x'.

Combine like terms: 0 + -7 = -7
-7 + -5x + 6x2 = 7 + 5x + -6x2 + -7 + -5x + 6x2

Reorder the terms:
-7 + -5x + 6x2 = 7 + -7 + 5x + -5x + -6x2 + 6x2

Combine like terms: 7 + -7 = 0
-7 + -5x + 6x2 = 0 + 5x + -5x + -6x2 + 6x2
-7 + -5x + 6x2 = 5x + -5x + -6x2 + 6x2

Combine like terms: 5x + -5x = 0
-7 + -5x + 6x2 = 0 + -6x2 + 6x2
-7 + -5x + 6x2 = -6x2 + 6x2

Combine like terms: -6x2 + 6x2 = 0
-7 + -5x + 6x2 = 0

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

Divide each side by '6'.
-1.166666667 + -0.8333333333x + x2 = 0

Move the constant term to the right:

Add '1.166666667' to each side of the equation.
-1.166666667 + -0.8333333333x + 1.166666667 + x2 = 0 + 1.166666667

Reorder the terms:
-1.166666667 + 1.166666667 + -0.8333333333x + x2 = 0 + 1.166666667

Combine like terms: -1.166666667 + 1.166666667 = 0.000000000
0.000000000 + -0.8333333333x + x2 = 0 + 1.166666667
-0.8333333333x + x2 = 0 + 1.166666667

Combine like terms: 0 + 1.166666667 = 1.166666667
-0.8333333333x + x2 = 1.166666667

The x term is -0.8333333333x.  Take half its coefficient (-0.4166666667).
Square it (0.1736111111) and add it to both sides.

Add '0.1736111111' to each side of the equation.
-0.8333333333x + 0.1736111111 + x2 = 1.166666667 + 0.1736111111

Reorder the terms:
0.1736111111 + -0.8333333333x + x2 = 1.166666667 + 0.1736111111

Combine like terms: 1.166666667 + 0.1736111111 = 1.3402777781
0.1736111111 + -0.8333333333x + x2 = 1.3402777781

Factor a perfect square on the left side:
(x + -0.4166666667)(x + -0.4166666667) = 1.3402777781

Calculate the square root of the right side: 1.157703666

Break this problem into two subproblems by setting 
(x + -0.4166666667) equal to 1.157703666 and -1.157703666.

Subproblem 1

x + -0.4166666667 = 1.157703666 Simplifying x + -0.4166666667 = 1.157703666 Reorder the terms: -0.4166666667 + x = 1.157703666 Solving -0.4166666667 + x = 1.157703666 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4166666667' to each side of the equation. -0.4166666667 + 0.4166666667 + x = 1.157703666 + 0.4166666667 Combine like terms: -0.4166666667 + 0.4166666667 = 0.0000000000 0.0000000000 + x = 1.157703666 + 0.4166666667 x = 1.157703666 + 0.4166666667 Combine like terms: 1.157703666 + 0.4166666667 = 1.5743703327 x = 1.5743703327 Simplifying x = 1.5743703327

Subproblem 2

x + -0.4166666667 = -1.157703666 Simplifying x + -0.4166666667 = -1.157703666 Reorder the terms: -0.4166666667 + x = -1.157703666 Solving -0.4166666667 + x = -1.157703666 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4166666667' to each side of the equation. -0.4166666667 + 0.4166666667 + x = -1.157703666 + 0.4166666667 Combine like terms: -0.4166666667 + 0.4166666667 = 0.0000000000 0.0000000000 + x = -1.157703666 + 0.4166666667 x = -1.157703666 + 0.4166666667 Combine like terms: -1.157703666 + 0.4166666667 = -0.7410369993 x = -0.7410369993 Simplifying x = -0.7410369993

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.5743703327, -0.7410369993}

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