15x^2-3x=64

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Solution for 15x^2-3x=64 equation:


Simplifying
15x2 + -3x = 64

Reorder the terms:
-3x + 15x2 = 64

Solving
-3x + 15x2 = 64

Solving for variable 'x'.

Reorder the terms:
-64 + -3x + 15x2 = 64 + -64

Combine like terms: 64 + -64 = 0
-64 + -3x + 15x2 = 0

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

Divide each side by '15'.
-4.266666667 + -0.2x + x2 = 0

Move the constant term to the right:

Add '4.266666667' to each side of the equation.
-4.266666667 + -0.2x + 4.266666667 + x2 = 0 + 4.266666667

Reorder the terms:
-4.266666667 + 4.266666667 + -0.2x + x2 = 0 + 4.266666667

Combine like terms: -4.266666667 + 4.266666667 = 0.000000000
0.000000000 + -0.2x + x2 = 0 + 4.266666667
-0.2x + x2 = 0 + 4.266666667

Combine like terms: 0 + 4.266666667 = 4.266666667
-0.2x + x2 = 4.266666667

The x term is -0.2x.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2x + 0.01 + x2 = 4.266666667 + 0.01

Reorder the terms:
0.01 + -0.2x + x2 = 4.266666667 + 0.01

Combine like terms: 4.266666667 + 0.01 = 4.276666667
0.01 + -0.2x + x2 = 4.276666667

Factor a perfect square on the left side:
(x + -0.1)(x + -0.1) = 4.276666667

Calculate the square root of the right side: 2.068010316

Break this problem into two subproblems by setting 
(x + -0.1) equal to 2.068010316 and -2.068010316.

Subproblem 1

x + -0.1 = 2.068010316 Simplifying x + -0.1 = 2.068010316 Reorder the terms: -0.1 + x = 2.068010316 Solving -0.1 + x = 2.068010316 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = 2.068010316 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = 2.068010316 + 0.1 x = 2.068010316 + 0.1 Combine like terms: 2.068010316 + 0.1 = 2.168010316 x = 2.168010316 Simplifying x = 2.168010316

Subproblem 2

x + -0.1 = -2.068010316 Simplifying x + -0.1 = -2.068010316 Reorder the terms: -0.1 + x = -2.068010316 Solving -0.1 + x = -2.068010316 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = -2.068010316 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = -2.068010316 + 0.1 x = -2.068010316 + 0.1 Combine like terms: -2.068010316 + 0.1 = -1.968010316 x = -1.968010316 Simplifying x = -1.968010316

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.168010316, -1.968010316}

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