8x^2+27x=7

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Solution for 8x^2+27x=7 equation:


Simplifying
8x2 + 27x = 7

Reorder the terms:
27x + 8x2 = 7

Solving
27x + 8x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + 27x + 8x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + 27x + 8x2 = 0

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

Divide each side by '8'.
-0.875 + 3.375x + x2 = 0

Move the constant term to the right:

Add '0.875' to each side of the equation.
-0.875 + 3.375x + 0.875 + x2 = 0 + 0.875

Reorder the terms:
-0.875 + 0.875 + 3.375x + x2 = 0 + 0.875

Combine like terms: -0.875 + 0.875 = 0.000
0.000 + 3.375x + x2 = 0 + 0.875
3.375x + x2 = 0 + 0.875

Combine like terms: 0 + 0.875 = 0.875
3.375x + x2 = 0.875

The x term is 3.375x.  Take half its coefficient (1.6875).
Square it (2.84765625) and add it to both sides.

Add '2.84765625' to each side of the equation.
3.375x + 2.84765625 + x2 = 0.875 + 2.84765625

Reorder the terms:
2.84765625 + 3.375x + x2 = 0.875 + 2.84765625

Combine like terms: 0.875 + 2.84765625 = 3.72265625
2.84765625 + 3.375x + x2 = 3.72265625

Factor a perfect square on the left side:
(x + 1.6875)(x + 1.6875) = 3.72265625

Calculate the square root of the right side: 1.92941863

Break this problem into two subproblems by setting 
(x + 1.6875) equal to 1.92941863 and -1.92941863.

Subproblem 1

x + 1.6875 = 1.92941863 Simplifying x + 1.6875 = 1.92941863 Reorder the terms: 1.6875 + x = 1.92941863 Solving 1.6875 + x = 1.92941863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6875' to each side of the equation. 1.6875 + -1.6875 + x = 1.92941863 + -1.6875 Combine like terms: 1.6875 + -1.6875 = 0.0000 0.0000 + x = 1.92941863 + -1.6875 x = 1.92941863 + -1.6875 Combine like terms: 1.92941863 + -1.6875 = 0.24191863 x = 0.24191863 Simplifying x = 0.24191863

Subproblem 2

x + 1.6875 = -1.92941863 Simplifying x + 1.6875 = -1.92941863 Reorder the terms: 1.6875 + x = -1.92941863 Solving 1.6875 + x = -1.92941863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6875' to each side of the equation. 1.6875 + -1.6875 + x = -1.92941863 + -1.6875 Combine like terms: 1.6875 + -1.6875 = 0.0000 0.0000 + x = -1.92941863 + -1.6875 x = -1.92941863 + -1.6875 Combine like terms: -1.92941863 + -1.6875 = -3.61691863 x = -3.61691863 Simplifying x = -3.61691863

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.24191863, -3.61691863}

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