5x(5x+8)=49

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Solution for 5x(5x+8)=49 equation:


Simplifying
5x(5x + 8) = 49

Reorder the terms:
5x(8 + 5x) = 49
(8 * 5x + 5x * 5x) = 49
(40x + 25x2) = 49

Solving
40x + 25x2 = 49

Solving for variable 'x'.

Reorder the terms:
-49 + 40x + 25x2 = 49 + -49

Combine like terms: 49 + -49 = 0
-49 + 40x + 25x2 = 0

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

Divide each side by '25'.
-1.96 + 1.6x + x2 = 0

Move the constant term to the right:

Add '1.96' to each side of the equation.
-1.96 + 1.6x + 1.96 + x2 = 0 + 1.96

Reorder the terms:
-1.96 + 1.96 + 1.6x + x2 = 0 + 1.96

Combine like terms: -1.96 + 1.96 = 0.00
0.00 + 1.6x + x2 = 0 + 1.96
1.6x + x2 = 0 + 1.96

Combine like terms: 0 + 1.96 = 1.96
1.6x + x2 = 1.96

The x term is 1.6x.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6x + 0.64 + x2 = 1.96 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = 1.96 + 0.64

Combine like terms: 1.96 + 0.64 = 2.6
0.64 + 1.6x + x2 = 2.6

Factor a perfect square on the left side:
(x + 0.8)(x + 0.8) = 2.6

Calculate the square root of the right side: 1.61245155

Break this problem into two subproblems by setting 
(x + 0.8) equal to 1.61245155 and -1.61245155.

Subproblem 1

x + 0.8 = 1.61245155 Simplifying x + 0.8 = 1.61245155 Reorder the terms: 0.8 + x = 1.61245155 Solving 0.8 + x = 1.61245155 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = 1.61245155 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = 1.61245155 + -0.8 x = 1.61245155 + -0.8 Combine like terms: 1.61245155 + -0.8 = 0.81245155 x = 0.81245155 Simplifying x = 0.81245155

Subproblem 2

x + 0.8 = -1.61245155 Simplifying x + 0.8 = -1.61245155 Reorder the terms: 0.8 + x = -1.61245155 Solving 0.8 + x = -1.61245155 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = -1.61245155 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = -1.61245155 + -0.8 x = -1.61245155 + -0.8 Combine like terms: -1.61245155 + -0.8 = -2.41245155 x = -2.41245155 Simplifying x = -2.41245155

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.81245155, -2.41245155}

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