8x^2+10=2x+21

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Solution for 8x^2+10=2x+21 equation:


Simplifying
8x2 + 10 = 2x + 21

Reorder the terms:
10 + 8x2 = 2x + 21

Reorder the terms:
10 + 8x2 = 21 + 2x

Solving
10 + 8x2 = 21 + 2x

Solving for variable 'x'.

Reorder the terms:
10 + -21 + -2x + 8x2 = 21 + 2x + -21 + -2x

Combine like terms: 10 + -21 = -11
-11 + -2x + 8x2 = 21 + 2x + -21 + -2x

Reorder the terms:
-11 + -2x + 8x2 = 21 + -21 + 2x + -2x

Combine like terms: 21 + -21 = 0
-11 + -2x + 8x2 = 0 + 2x + -2x
-11 + -2x + 8x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-11 + -2x + 8x2 = 0

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

Divide each side by '8'.
-1.375 + -0.25x + x2 = 0

Move the constant term to the right:

Add '1.375' to each side of the equation.
-1.375 + -0.25x + 1.375 + x2 = 0 + 1.375

Reorder the terms:
-1.375 + 1.375 + -0.25x + x2 = 0 + 1.375

Combine like terms: -1.375 + 1.375 = 0.000
0.000 + -0.25x + x2 = 0 + 1.375
-0.25x + x2 = 0 + 1.375

Combine like terms: 0 + 1.375 = 1.375
-0.25x + x2 = 1.375

The x term is -0.25x.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25x + 0.015625 + x2 = 1.375 + 0.015625

Reorder the terms:
0.015625 + -0.25x + x2 = 1.375 + 0.015625

Combine like terms: 1.375 + 0.015625 = 1.390625
0.015625 + -0.25x + x2 = 1.390625

Factor a perfect square on the left side:
(x + -0.125)(x + -0.125) = 1.390625

Calculate the square root of the right side: 1.179247642

Break this problem into two subproblems by setting 
(x + -0.125) equal to 1.179247642 and -1.179247642.

Subproblem 1

x + -0.125 = 1.179247642 Simplifying x + -0.125 = 1.179247642 Reorder the terms: -0.125 + x = 1.179247642 Solving -0.125 + x = 1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = 1.179247642 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = 1.179247642 + 0.125 x = 1.179247642 + 0.125 Combine like terms: 1.179247642 + 0.125 = 1.304247642 x = 1.304247642 Simplifying x = 1.304247642

Subproblem 2

x + -0.125 = -1.179247642 Simplifying x + -0.125 = -1.179247642 Reorder the terms: -0.125 + x = -1.179247642 Solving -0.125 + x = -1.179247642 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = -1.179247642 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = -1.179247642 + 0.125 x = -1.179247642 + 0.125 Combine like terms: -1.179247642 + 0.125 = -1.054247642 x = -1.054247642 Simplifying x = -1.054247642

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.304247642, -1.054247642}

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