100x^2+60x+9=28

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Solution for 100x^2+60x+9=28 equation:


Simplifying
100x2 + 60x + 9 = 28

Reorder the terms:
9 + 60x + 100x2 = 28

Solving
9 + 60x + 100x2 = 28

Solving for variable 'x'.

Reorder the terms:
9 + -28 + 60x + 100x2 = 28 + -28

Combine like terms: 9 + -28 = -19
-19 + 60x + 100x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-19 + 60x + 100x2 = 0

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

Divide each side by '100'.
-0.19 + 0.6x + x2 = 0

Move the constant term to the right:

Add '0.19' to each side of the equation.
-0.19 + 0.6x + 0.19 + x2 = 0 + 0.19

Reorder the terms:
-0.19 + 0.19 + 0.6x + x2 = 0 + 0.19

Combine like terms: -0.19 + 0.19 = 0.00
0.00 + 0.6x + x2 = 0 + 0.19
0.6x + x2 = 0 + 0.19

Combine like terms: 0 + 0.19 = 0.19
0.6x + x2 = 0.19

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 0.19 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 0.19 + 0.09

Combine like terms: 0.19 + 0.09 = 0.28
0.09 + 0.6x + x2 = 0.28

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 0.28

Calculate the square root of the right side: 0.529150262

Break this problem into two subproblems by setting 
(x + 0.3) equal to 0.529150262 and -0.529150262.

Subproblem 1

x + 0.3 = 0.529150262 Simplifying x + 0.3 = 0.529150262 Reorder the terms: 0.3 + x = 0.529150262 Solving 0.3 + x = 0.529150262 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 0.529150262 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 0.529150262 + -0.3 x = 0.529150262 + -0.3 Combine like terms: 0.529150262 + -0.3 = 0.229150262 x = 0.229150262 Simplifying x = 0.229150262

Subproblem 2

x + 0.3 = -0.529150262 Simplifying x + 0.3 = -0.529150262 Reorder the terms: 0.3 + x = -0.529150262 Solving 0.3 + x = -0.529150262 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -0.529150262 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -0.529150262 + -0.3 x = -0.529150262 + -0.3 Combine like terms: -0.529150262 + -0.3 = -0.829150262 x = -0.829150262 Simplifying x = -0.829150262

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.229150262, -0.829150262}

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