5x^2-3x+2=15

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Solution for 5x^2-3x+2=15 equation:


Simplifying
5x2 + -3x + 2 = 15

Reorder the terms:
2 + -3x + 5x2 = 15

Solving
2 + -3x + 5x2 = 15

Solving for variable 'x'.

Reorder the terms:
2 + -15 + -3x + 5x2 = 15 + -15

Combine like terms: 2 + -15 = -13
-13 + -3x + 5x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-13 + -3x + 5x2 = 0

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

Divide each side by '5'.
-2.6 + -0.6x + x2 = 0

Move the constant term to the right:

Add '2.6' to each side of the equation.
-2.6 + -0.6x + 2.6 + x2 = 0 + 2.6

Reorder the terms:
-2.6 + 2.6 + -0.6x + x2 = 0 + 2.6

Combine like terms: -2.6 + 2.6 = 0.0
0.0 + -0.6x + x2 = 0 + 2.6
-0.6x + x2 = 0 + 2.6

Combine like terms: 0 + 2.6 = 2.6
-0.6x + x2 = 2.6

The x term is -0.6x.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6x + 0.09 + x2 = 2.6 + 0.09

Reorder the terms:
0.09 + -0.6x + x2 = 2.6 + 0.09

Combine like terms: 2.6 + 0.09 = 2.69
0.09 + -0.6x + x2 = 2.69

Factor a perfect square on the left side:
(x + -0.3)(x + -0.3) = 2.69

Calculate the square root of the right side: 1.640121947

Break this problem into two subproblems by setting 
(x + -0.3) equal to 1.640121947 and -1.640121947.

Subproblem 1

x + -0.3 = 1.640121947 Simplifying x + -0.3 = 1.640121947 Reorder the terms: -0.3 + x = 1.640121947 Solving -0.3 + x = 1.640121947 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = 1.640121947 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = 1.640121947 + 0.3 x = 1.640121947 + 0.3 Combine like terms: 1.640121947 + 0.3 = 1.940121947 x = 1.940121947 Simplifying x = 1.940121947

Subproblem 2

x + -0.3 = -1.640121947 Simplifying x + -0.3 = -1.640121947 Reorder the terms: -0.3 + x = -1.640121947 Solving -0.3 + x = -1.640121947 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = -1.640121947 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = -1.640121947 + 0.3 x = -1.640121947 + 0.3 Combine like terms: -1.640121947 + 0.3 = -1.340121947 x = -1.340121947 Simplifying x = -1.340121947

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.940121947, -1.340121947}

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