0=-7x^2-11x+3

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Solution for 0=-7x^2-11x+3 equation:


Simplifying
0 = -7x2 + -11x + 3

Reorder the terms:
0 = 3 + -11x + -7x2

Solving
0 = 3 + -11x + -7x2

Solving for variable 'x'.

Combine like terms: 0 + -3 = -3
-3 + 11x + 7x2 = 3 + -11x + -7x2 + -3 + 11x + 7x2

Reorder the terms:
-3 + 11x + 7x2 = 3 + -3 + -11x + 11x + -7x2 + 7x2

Combine like terms: 3 + -3 = 0
-3 + 11x + 7x2 = 0 + -11x + 11x + -7x2 + 7x2
-3 + 11x + 7x2 = -11x + 11x + -7x2 + 7x2

Combine like terms: -11x + 11x = 0
-3 + 11x + 7x2 = 0 + -7x2 + 7x2
-3 + 11x + 7x2 = -7x2 + 7x2

Combine like terms: -7x2 + 7x2 = 0
-3 + 11x + 7x2 = 0

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

Divide each side by '7'.
-0.4285714286 + 1.571428571x + x2 = 0

Move the constant term to the right:

Add '0.4285714286' to each side of the equation.
-0.4285714286 + 1.571428571x + 0.4285714286 + x2 = 0 + 0.4285714286

Reorder the terms:
-0.4285714286 + 0.4285714286 + 1.571428571x + x2 = 0 + 0.4285714286

Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000
0.0000000000 + 1.571428571x + x2 = 0 + 0.4285714286
1.571428571x + x2 = 0 + 0.4285714286

Combine like terms: 0 + 0.4285714286 = 0.4285714286
1.571428571x + x2 = 0.4285714286

The x term is 1.571428571x.  Take half its coefficient (0.7857142855).
Square it (0.6173469384) and add it to both sides.

Add '0.6173469384' to each side of the equation.
1.571428571x + 0.6173469384 + x2 = 0.4285714286 + 0.6173469384

Reorder the terms:
0.6173469384 + 1.571428571x + x2 = 0.4285714286 + 0.6173469384

Combine like terms: 0.4285714286 + 0.6173469384 = 1.045918367
0.6173469384 + 1.571428571x + x2 = 1.045918367

Factor a perfect square on the left side:
(x + 0.7857142855)(x + 0.7857142855) = 1.045918367

Calculate the square root of the right side: 1.022701504

Break this problem into two subproblems by setting 
(x + 0.7857142855) equal to 1.022701504 and -1.022701504.

Subproblem 1

x + 0.7857142855 = 1.022701504 Simplifying x + 0.7857142855 = 1.022701504 Reorder the terms: 0.7857142855 + x = 1.022701504 Solving 0.7857142855 + x = 1.022701504 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7857142855' to each side of the equation. 0.7857142855 + -0.7857142855 + x = 1.022701504 + -0.7857142855 Combine like terms: 0.7857142855 + -0.7857142855 = 0.0000000000 0.0000000000 + x = 1.022701504 + -0.7857142855 x = 1.022701504 + -0.7857142855 Combine like terms: 1.022701504 + -0.7857142855 = 0.2369872185 x = 0.2369872185 Simplifying x = 0.2369872185

Subproblem 2

x + 0.7857142855 = -1.022701504 Simplifying x + 0.7857142855 = -1.022701504 Reorder the terms: 0.7857142855 + x = -1.022701504 Solving 0.7857142855 + x = -1.022701504 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7857142855' to each side of the equation. 0.7857142855 + -0.7857142855 + x = -1.022701504 + -0.7857142855 Combine like terms: 0.7857142855 + -0.7857142855 = 0.0000000000 0.0000000000 + x = -1.022701504 + -0.7857142855 x = -1.022701504 + -0.7857142855 Combine like terms: -1.022701504 + -0.7857142855 = -1.8084157895 x = -1.8084157895 Simplifying x = -1.8084157895

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2369872185, -1.8084157895}

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