3x^2+70x-1200=0

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Solution for 3x^2+70x-1200=0 equation:


Simplifying
3x2 + 70x + -1200 = 0

Reorder the terms:
-1200 + 70x + 3x2 = 0

Solving
-1200 + 70x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-400 + 23.33333333x + x2 = 0

Move the constant term to the right:

Add '400' to each side of the equation.
-400 + 23.33333333x + 400 + x2 = 0 + 400

Reorder the terms:
-400 + 400 + 23.33333333x + x2 = 0 + 400

Combine like terms: -400 + 400 = 0
0 + 23.33333333x + x2 = 0 + 400
23.33333333x + x2 = 0 + 400

Combine like terms: 0 + 400 = 400
23.33333333x + x2 = 400

The x term is 23.33333333x.  Take half its coefficient (11.66666667).
Square it (136.1111112) and add it to both sides.

Add '136.1111112' to each side of the equation.
23.33333333x + 136.1111112 + x2 = 400 + 136.1111112

Reorder the terms:
136.1111112 + 23.33333333x + x2 = 400 + 136.1111112

Combine like terms: 400 + 136.1111112 = 536.1111112
136.1111112 + 23.33333333x + x2 = 536.1111112

Factor a perfect square on the left side:
(x + 11.66666667)(x + 11.66666667) = 536.1111112

Calculate the square root of the right side: 23.154073318

Break this problem into two subproblems by setting 
(x + 11.66666667) equal to 23.154073318 and -23.154073318.

Subproblem 1

x + 11.66666667 = 23.154073318 Simplifying x + 11.66666667 = 23.154073318 Reorder the terms: 11.66666667 + x = 23.154073318 Solving 11.66666667 + x = 23.154073318 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11.66666667' to each side of the equation. 11.66666667 + -11.66666667 + x = 23.154073318 + -11.66666667 Combine like terms: 11.66666667 + -11.66666667 = 0.00000000 0.00000000 + x = 23.154073318 + -11.66666667 x = 23.154073318 + -11.66666667 Combine like terms: 23.154073318 + -11.66666667 = 11.487406648 x = 11.487406648 Simplifying x = 11.487406648

Subproblem 2

x + 11.66666667 = -23.154073318 Simplifying x + 11.66666667 = -23.154073318 Reorder the terms: 11.66666667 + x = -23.154073318 Solving 11.66666667 + x = -23.154073318 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11.66666667' to each side of the equation. 11.66666667 + -11.66666667 + x = -23.154073318 + -11.66666667 Combine like terms: 11.66666667 + -11.66666667 = 0.00000000 0.00000000 + x = -23.154073318 + -11.66666667 x = -23.154073318 + -11.66666667 Combine like terms: -23.154073318 + -11.66666667 = -34.820739988 x = -34.820739988 Simplifying x = -34.820739988

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.487406648, -34.820739988}

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