25x^2-42x+9=0

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Solution for 25x^2-42x+9=0 equation:


Simplifying
25x2 + -42x + 9 = 0

Reorder the terms:
9 + -42x + 25x2 = 0

Solving
9 + -42x + 25x2 = 0

Solving for variable 'x'.

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

Divide each side by '25'.
0.36 + -1.68x + x2 = 0

Move the constant term to the right:

Add '-0.36' to each side of the equation.
0.36 + -1.68x + -0.36 + x2 = 0 + -0.36

Reorder the terms:
0.36 + -0.36 + -1.68x + x2 = 0 + -0.36

Combine like terms: 0.36 + -0.36 = 0.00
0.00 + -1.68x + x2 = 0 + -0.36
-1.68x + x2 = 0 + -0.36

Combine like terms: 0 + -0.36 = -0.36
-1.68x + x2 = -0.36

The x term is -1.68x.  Take half its coefficient (-0.84).
Square it (0.7056) and add it to both sides.

Add '0.7056' to each side of the equation.
-1.68x + 0.7056 + x2 = -0.36 + 0.7056

Reorder the terms:
0.7056 + -1.68x + x2 = -0.36 + 0.7056

Combine like terms: -0.36 + 0.7056 = 0.3456
0.7056 + -1.68x + x2 = 0.3456

Factor a perfect square on the left side:
(x + -0.84)(x + -0.84) = 0.3456

Calculate the square root of the right side: 0.587877538

Break this problem into two subproblems by setting 
(x + -0.84) equal to 0.587877538 and -0.587877538.

Subproblem 1

x + -0.84 = 0.587877538 Simplifying x + -0.84 = 0.587877538 Reorder the terms: -0.84 + x = 0.587877538 Solving -0.84 + x = 0.587877538 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.84' to each side of the equation. -0.84 + 0.84 + x = 0.587877538 + 0.84 Combine like terms: -0.84 + 0.84 = 0.00 0.00 + x = 0.587877538 + 0.84 x = 0.587877538 + 0.84 Combine like terms: 0.587877538 + 0.84 = 1.427877538 x = 1.427877538 Simplifying x = 1.427877538

Subproblem 2

x + -0.84 = -0.587877538 Simplifying x + -0.84 = -0.587877538 Reorder the terms: -0.84 + x = -0.587877538 Solving -0.84 + x = -0.587877538 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.84' to each side of the equation. -0.84 + 0.84 + x = -0.587877538 + 0.84 Combine like terms: -0.84 + 0.84 = 0.00 0.00 + x = -0.587877538 + 0.84 x = -0.587877538 + 0.84 Combine like terms: -0.587877538 + 0.84 = 0.252122462 x = 0.252122462 Simplifying x = 0.252122462

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.427877538, 0.252122462}

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