25x^2+20x=7

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Solution for 25x^2+20x=7 equation:


Simplifying
25x2 + 20x = 7

Reorder the terms:
20x + 25x2 = 7

Solving
20x + 25x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + 20x + 25x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + 20x + 25x2 = 0

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

Divide each side by '25'.
-0.28 + 0.8x + x2 = 0

Move the constant term to the right:

Add '0.28' to each side of the equation.
-0.28 + 0.8x + 0.28 + x2 = 0 + 0.28

Reorder the terms:
-0.28 + 0.28 + 0.8x + x2 = 0 + 0.28

Combine like terms: -0.28 + 0.28 = 0.00
0.00 + 0.8x + x2 = 0 + 0.28
0.8x + x2 = 0 + 0.28

Combine like terms: 0 + 0.28 = 0.28
0.8x + x2 = 0.28

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = 0.28 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 0.28 + 0.16

Combine like terms: 0.28 + 0.16 = 0.44
0.16 + 0.8x + x2 = 0.44

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 0.44

Calculate the square root of the right side: 0.663324958

Break this problem into two subproblems by setting 
(x + 0.4) equal to 0.663324958 and -0.663324958.

Subproblem 1

x + 0.4 = 0.663324958 Simplifying x + 0.4 = 0.663324958 Reorder the terms: 0.4 + x = 0.663324958 Solving 0.4 + x = 0.663324958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 0.663324958 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 0.663324958 + -0.4 x = 0.663324958 + -0.4 Combine like terms: 0.663324958 + -0.4 = 0.263324958 x = 0.263324958 Simplifying x = 0.263324958

Subproblem 2

x + 0.4 = -0.663324958 Simplifying x + 0.4 = -0.663324958 Reorder the terms: 0.4 + x = -0.663324958 Solving 0.4 + x = -0.663324958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -0.663324958 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -0.663324958 + -0.4 x = -0.663324958 + -0.4 Combine like terms: -0.663324958 + -0.4 = -1.063324958 x = -1.063324958 Simplifying x = -1.063324958

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.263324958, -1.063324958}

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