25x^2+5x=7

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Solution for 25x^2+5x=7 equation:


Simplifying
25x2 + 5x = 7

Reorder the terms:
5x + 25x2 = 7

Solving
5x + 25x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + 5x + 25x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + 5x + 25x2 = 0

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

Divide each side by '25'.
-0.28 + 0.2x + x2 = 0

Move the constant term to the right:

Add '0.28' to each side of the equation.
-0.28 + 0.2x + 0.28 + x2 = 0 + 0.28

Reorder the terms:
-0.28 + 0.28 + 0.2x + x2 = 0 + 0.28

Combine like terms: -0.28 + 0.28 = 0.00
0.00 + 0.2x + x2 = 0 + 0.28
0.2x + x2 = 0 + 0.28

Combine like terms: 0 + 0.28 = 0.28
0.2x + x2 = 0.28

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 = 0.28 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 0.28 + 0.01

Combine like terms: 0.28 + 0.01 = 0.29
0.01 + 0.2x + x2 = 0.29

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 0.29

Calculate the square root of the right side: 0.538516481

Break this problem into two subproblems by setting 
(x + 0.1) equal to 0.538516481 and -0.538516481.

Subproblem 1

x + 0.1 = 0.538516481 Simplifying x + 0.1 = 0.538516481 Reorder the terms: 0.1 + x = 0.538516481 Solving 0.1 + x = 0.538516481 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 = 0.538516481 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 0.538516481 + -0.1 x = 0.538516481 + -0.1 Combine like terms: 0.538516481 + -0.1 = 0.438516481 x = 0.438516481 Simplifying x = 0.438516481

Subproblem 2

x + 0.1 = -0.538516481 Simplifying x + 0.1 = -0.538516481 Reorder the terms: 0.1 + x = -0.538516481 Solving 0.1 + x = -0.538516481 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 = -0.538516481 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -0.538516481 + -0.1 x = -0.538516481 + -0.1 Combine like terms: -0.538516481 + -0.1 = -0.638516481 x = -0.638516481 Simplifying x = -0.638516481

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.438516481, -0.638516481}

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