25x^2-280x-51=0

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Solution for 25x^2-280x-51=0 equation:


Simplifying
25x2 + -280x + -51 = 0

Reorder the terms:
-51 + -280x + 25x2 = 0

Solving
-51 + -280x + 25x2 = 0

Solving for variable 'x'.

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

Divide each side by '25'.
-2.04 + -11.2x + x2 = 0

Move the constant term to the right:

Add '2.04' to each side of the equation.
-2.04 + -11.2x + 2.04 + x2 = 0 + 2.04

Reorder the terms:
-2.04 + 2.04 + -11.2x + x2 = 0 + 2.04

Combine like terms: -2.04 + 2.04 = 0.00
0.00 + -11.2x + x2 = 0 + 2.04
-11.2x + x2 = 0 + 2.04

Combine like terms: 0 + 2.04 = 2.04
-11.2x + x2 = 2.04

The x term is -11.2x.  Take half its coefficient (-5.6).
Square it (31.36) and add it to both sides.

Add '31.36' to each side of the equation.
-11.2x + 31.36 + x2 = 2.04 + 31.36

Reorder the terms:
31.36 + -11.2x + x2 = 2.04 + 31.36

Combine like terms: 2.04 + 31.36 = 33.4
31.36 + -11.2x + x2 = 33.4

Factor a perfect square on the left side:
(x + -5.6)(x + -5.6) = 33.4

Calculate the square root of the right side: 5.779273311

Break this problem into two subproblems by setting 
(x + -5.6) equal to 5.779273311 and -5.779273311.

Subproblem 1

x + -5.6 = 5.779273311 Simplifying x + -5.6 = 5.779273311 Reorder the terms: -5.6 + x = 5.779273311 Solving -5.6 + x = 5.779273311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.6' to each side of the equation. -5.6 + 5.6 + x = 5.779273311 + 5.6 Combine like terms: -5.6 + 5.6 = 0.0 0.0 + x = 5.779273311 + 5.6 x = 5.779273311 + 5.6 Combine like terms: 5.779273311 + 5.6 = 11.379273311 x = 11.379273311 Simplifying x = 11.379273311

Subproblem 2

x + -5.6 = -5.779273311 Simplifying x + -5.6 = -5.779273311 Reorder the terms: -5.6 + x = -5.779273311 Solving -5.6 + x = -5.779273311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.6' to each side of the equation. -5.6 + 5.6 + x = -5.779273311 + 5.6 Combine like terms: -5.6 + 5.6 = 0.0 0.0 + x = -5.779273311 + 5.6 x = -5.779273311 + 5.6 Combine like terms: -5.779273311 + 5.6 = -0.179273311 x = -0.179273311 Simplifying x = -0.179273311

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.379273311, -0.179273311}

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