100x^2+9=3x+21

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Solution for 100x^2+9=3x+21 equation:


Simplifying
100x2 + 9 = 3x + 21

Reorder the terms:
9 + 100x2 = 3x + 21

Reorder the terms:
9 + 100x2 = 21 + 3x

Solving
9 + 100x2 = 21 + 3x

Solving for variable 'x'.

Reorder the terms:
9 + -21 + -3x + 100x2 = 21 + 3x + -21 + -3x

Combine like terms: 9 + -21 = -12
-12 + -3x + 100x2 = 21 + 3x + -21 + -3x

Reorder the terms:
-12 + -3x + 100x2 = 21 + -21 + 3x + -3x

Combine like terms: 21 + -21 = 0
-12 + -3x + 100x2 = 0 + 3x + -3x
-12 + -3x + 100x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-12 + -3x + 100x2 = 0

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

Divide each side by '100'.
-0.12 + -0.03x + x2 = 0

Move the constant term to the right:

Add '0.12' to each side of the equation.
-0.12 + -0.03x + 0.12 + x2 = 0 + 0.12

Reorder the terms:
-0.12 + 0.12 + -0.03x + x2 = 0 + 0.12

Combine like terms: -0.12 + 0.12 = 0.00
0.00 + -0.03x + x2 = 0 + 0.12
-0.03x + x2 = 0 + 0.12

Combine like terms: 0 + 0.12 = 0.12
-0.03x + x2 = 0.12

The x term is -0.03x.  Take half its coefficient (-0.015).
Square it (0.000225) and add it to both sides.

Add '0.000225' to each side of the equation.
-0.03x + 0.000225 + x2 = 0.12 + 0.000225

Reorder the terms:
0.000225 + -0.03x + x2 = 0.12 + 0.000225

Combine like terms: 0.12 + 0.000225 = 0.120225
0.000225 + -0.03x + x2 = 0.120225

Factor a perfect square on the left side:
(x + -0.015)(x + -0.015) = 0.120225

Calculate the square root of the right side: 0.346734769

Break this problem into two subproblems by setting 
(x + -0.015) equal to 0.346734769 and -0.346734769.

Subproblem 1

x + -0.015 = 0.346734769 Simplifying x + -0.015 = 0.346734769 Reorder the terms: -0.015 + x = 0.346734769 Solving -0.015 + x = 0.346734769 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.015' to each side of the equation. -0.015 + 0.015 + x = 0.346734769 + 0.015 Combine like terms: -0.015 + 0.015 = 0.000 0.000 + x = 0.346734769 + 0.015 x = 0.346734769 + 0.015 Combine like terms: 0.346734769 + 0.015 = 0.361734769 x = 0.361734769 Simplifying x = 0.361734769

Subproblem 2

x + -0.015 = -0.346734769 Simplifying x + -0.015 = -0.346734769 Reorder the terms: -0.015 + x = -0.346734769 Solving -0.015 + x = -0.346734769 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.015' to each side of the equation. -0.015 + 0.015 + x = -0.346734769 + 0.015 Combine like terms: -0.015 + 0.015 = 0.000 0.000 + x = -0.346734769 + 0.015 x = -0.346734769 + 0.015 Combine like terms: -0.346734769 + 0.015 = -0.331734769 x = -0.331734769 Simplifying x = -0.331734769

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.361734769, -0.331734769}

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