6-3x(4x-5)=7

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Solution for 6-3x(4x-5)=7 equation:


Simplifying
6 + -3x(4x + -5) = 7

Reorder the terms:
6 + -3x(-5 + 4x) = 7
6 + (-5 * -3x + 4x * -3x) = 7
6 + (15x + -12x2) = 7

Solving
6 + 15x + -12x2 = 7

Solving for variable 'x'.

Reorder the terms:
6 + -7 + 15x + -12x2 = 7 + -7

Combine like terms: 6 + -7 = -1
-1 + 15x + -12x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-1 + 15x + -12x2 = 0

Begin completing the square.  Divide all terms by
-12 the coefficient of the squared term: 

Divide each side by '-12'.
0.08333333333 + -1.25x + x2 = 0

Move the constant term to the right:

Add '-0.08333333333' to each side of the equation.
0.08333333333 + -1.25x + -0.08333333333 + x2 = 0 + -0.08333333333

Reorder the terms:
0.08333333333 + -0.08333333333 + -1.25x + x2 = 0 + -0.08333333333

Combine like terms: 0.08333333333 + -0.08333333333 = 0.00000000000
0.00000000000 + -1.25x + x2 = 0 + -0.08333333333
-1.25x + x2 = 0 + -0.08333333333

Combine like terms: 0 + -0.08333333333 = -0.08333333333
-1.25x + x2 = -0.08333333333

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = -0.08333333333 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = -0.08333333333 + 0.390625

Combine like terms: -0.08333333333 + 0.390625 = 0.30729166667
0.390625 + -1.25x + x2 = 0.30729166667

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 0.30729166667

Calculate the square root of the right side: 0.554338946

Break this problem into two subproblems by setting 
(x + -0.625) equal to 0.554338946 and -0.554338946.

Subproblem 1

x + -0.625 = 0.554338946 Simplifying x + -0.625 = 0.554338946 Reorder the terms: -0.625 + x = 0.554338946 Solving -0.625 + x = 0.554338946 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = 0.554338946 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 0.554338946 + 0.625 x = 0.554338946 + 0.625 Combine like terms: 0.554338946 + 0.625 = 1.179338946 x = 1.179338946 Simplifying x = 1.179338946

Subproblem 2

x + -0.625 = -0.554338946 Simplifying x + -0.625 = -0.554338946 Reorder the terms: -0.625 + x = -0.554338946 Solving -0.625 + x = -0.554338946 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = -0.554338946 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -0.554338946 + 0.625 x = -0.554338946 + 0.625 Combine like terms: -0.554338946 + 0.625 = 0.070661054 x = 0.070661054 Simplifying x = 0.070661054

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.179338946, 0.070661054}

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