7.56X^2+2.64X=5.21

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Solution for 7.56X^2+2.64X=5.21 equation:


Simplifying
7.56X2 + 2.64X = 5.21

Reorder the terms:
2.64X + 7.56X2 = 5.21

Solving
2.64X + 7.56X2 = 5.21

Solving for variable 'X'.

Reorder the terms:
-5.21 + 2.64X + 7.56X2 = 5.21 + -5.21

Combine like terms: 5.21 + -5.21 = 0.00
-5.21 + 2.64X + 7.56X2 = 0.00

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

Divide each side by '7.56'.
-0.6891534392 + 0.3492063492X + X2 = 0

Move the constant term to the right:

Add '0.6891534392' to each side of the equation.
-0.6891534392 + 0.3492063492X + 0.6891534392 + X2 = 0 + 0.6891534392

Reorder the terms:
-0.6891534392 + 0.6891534392 + 0.3492063492X + X2 = 0 + 0.6891534392

Combine like terms: -0.6891534392 + 0.6891534392 = 0.0000000000
0.0000000000 + 0.3492063492X + X2 = 0 + 0.6891534392
0.3492063492X + X2 = 0 + 0.6891534392

Combine like terms: 0 + 0.6891534392 = 0.6891534392
0.3492063492X + X2 = 0.6891534392

The X term is 0.3492063492X.  Take half its coefficient (0.1746031746).
Square it (0.03048626858) and add it to both sides.

Add '0.03048626858' to each side of the equation.
0.3492063492X + 0.03048626858 + X2 = 0.6891534392 + 0.03048626858

Reorder the terms:
0.03048626858 + 0.3492063492X + X2 = 0.6891534392 + 0.03048626858

Combine like terms: 0.6891534392 + 0.03048626858 = 0.71963970778
0.03048626858 + 0.3492063492X + X2 = 0.71963970778

Factor a perfect square on the left side:
(X + 0.1746031746)(X + 0.1746031746) = 0.71963970778

Calculate the square root of the right side: 0.848315807

Break this problem into two subproblems by setting 
(X + 0.1746031746) equal to 0.848315807 and -0.848315807.

Subproblem 1

X + 0.1746031746 = 0.848315807 Simplifying X + 0.1746031746 = 0.848315807 Reorder the terms: 0.1746031746 + X = 0.848315807 Solving 0.1746031746 + X = 0.848315807 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.1746031746' to each side of the equation. 0.1746031746 + -0.1746031746 + X = 0.848315807 + -0.1746031746 Combine like terms: 0.1746031746 + -0.1746031746 = 0.0000000000 0.0000000000 + X = 0.848315807 + -0.1746031746 X = 0.848315807 + -0.1746031746 Combine like terms: 0.848315807 + -0.1746031746 = 0.6737126324 X = 0.6737126324 Simplifying X = 0.6737126324

Subproblem 2

X + 0.1746031746 = -0.848315807 Simplifying X + 0.1746031746 = -0.848315807 Reorder the terms: 0.1746031746 + X = -0.848315807 Solving 0.1746031746 + X = -0.848315807 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.1746031746' to each side of the equation. 0.1746031746 + -0.1746031746 + X = -0.848315807 + -0.1746031746 Combine like terms: 0.1746031746 + -0.1746031746 = 0.0000000000 0.0000000000 + X = -0.848315807 + -0.1746031746 X = -0.848315807 + -0.1746031746 Combine like terms: -0.848315807 + -0.1746031746 = -1.0229189816 X = -1.0229189816 Simplifying X = -1.0229189816

Solution

The solution to the problem is based on the solutions from the subproblems. X = {0.6737126324, -1.0229189816}

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