10x^2-17x-18=-11

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Solution for 10x^2-17x-18=-11 equation:


Simplifying
10x2 + -17x + -18 = -11

Reorder the terms:
-18 + -17x + 10x2 = -11

Solving
-18 + -17x + 10x2 = -11

Solving for variable 'x'.

Reorder the terms:
-18 + 11 + -17x + 10x2 = -11 + 11

Combine like terms: -18 + 11 = -7
-7 + -17x + 10x2 = -11 + 11

Combine like terms: -11 + 11 = 0
-7 + -17x + 10x2 = 0

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

Divide each side by '10'.
-0.7 + -1.7x + x2 = 0

Move the constant term to the right:

Add '0.7' to each side of the equation.
-0.7 + -1.7x + 0.7 + x2 = 0 + 0.7

Reorder the terms:
-0.7 + 0.7 + -1.7x + x2 = 0 + 0.7

Combine like terms: -0.7 + 0.7 = 0.0
0.0 + -1.7x + x2 = 0 + 0.7
-1.7x + x2 = 0 + 0.7

Combine like terms: 0 + 0.7 = 0.7
-1.7x + x2 = 0.7

The x term is -1.7x.  Take half its coefficient (-0.85).
Square it (0.7225) and add it to both sides.

Add '0.7225' to each side of the equation.
-1.7x + 0.7225 + x2 = 0.7 + 0.7225

Reorder the terms:
0.7225 + -1.7x + x2 = 0.7 + 0.7225

Combine like terms: 0.7 + 0.7225 = 1.4225
0.7225 + -1.7x + x2 = 1.4225

Factor a perfect square on the left side:
(x + -0.85)(x + -0.85) = 1.4225

Calculate the square root of the right side: 1.192686044

Break this problem into two subproblems by setting 
(x + -0.85) equal to 1.192686044 and -1.192686044.

Subproblem 1

x + -0.85 = 1.192686044 Simplifying x + -0.85 = 1.192686044 Reorder the terms: -0.85 + x = 1.192686044 Solving -0.85 + x = 1.192686044 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.85' to each side of the equation. -0.85 + 0.85 + x = 1.192686044 + 0.85 Combine like terms: -0.85 + 0.85 = 0.00 0.00 + x = 1.192686044 + 0.85 x = 1.192686044 + 0.85 Combine like terms: 1.192686044 + 0.85 = 2.042686044 x = 2.042686044 Simplifying x = 2.042686044

Subproblem 2

x + -0.85 = -1.192686044 Simplifying x + -0.85 = -1.192686044 Reorder the terms: -0.85 + x = -1.192686044 Solving -0.85 + x = -1.192686044 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.85' to each side of the equation. -0.85 + 0.85 + x = -1.192686044 + 0.85 Combine like terms: -0.85 + 0.85 = 0.00 0.00 + x = -1.192686044 + 0.85 x = -1.192686044 + 0.85 Combine like terms: -1.192686044 + 0.85 = -0.342686044 x = -0.342686044 Simplifying x = -0.342686044

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.042686044, -0.342686044}

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