4800-280x+4x^2=9

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Solution for 4800-280x+4x^2=9 equation:


Simplifying
4800 + -280x + 4x2 = 9

Solving
4800 + -280x + 4x2 = 9

Solving for variable 'x'.

Reorder the terms:
4800 + -9 + -280x + 4x2 = 9 + -9

Combine like terms: 4800 + -9 = 4791
4791 + -280x + 4x2 = 9 + -9

Combine like terms: 9 + -9 = 0
4791 + -280x + 4x2 = 0

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

Divide each side by '4'.
1197.75 + -70x + x2 = 0

Move the constant term to the right:

Add '-1197.75' to each side of the equation.
1197.75 + -70x + -1197.75 + x2 = 0 + -1197.75

Reorder the terms:
1197.75 + -1197.75 + -70x + x2 = 0 + -1197.75

Combine like terms: 1197.75 + -1197.75 = 0.00
0.00 + -70x + x2 = 0 + -1197.75
-70x + x2 = 0 + -1197.75

Combine like terms: 0 + -1197.75 = -1197.75
-70x + x2 = -1197.75

The x term is -70x.  Take half its coefficient (-35).
Square it (1225) and add it to both sides.

Add '1225' to each side of the equation.
-70x + 1225 + x2 = -1197.75 + 1225

Reorder the terms:
1225 + -70x + x2 = -1197.75 + 1225

Combine like terms: -1197.75 + 1225 = 27.25
1225 + -70x + x2 = 27.25

Factor a perfect square on the left side:
(x + -35)(x + -35) = 27.25

Calculate the square root of the right side: 5.220153254

Break this problem into two subproblems by setting 
(x + -35) equal to 5.220153254 and -5.220153254.

Subproblem 1

x + -35 = 5.220153254 Simplifying x + -35 = 5.220153254 Reorder the terms: -35 + x = 5.220153254 Solving -35 + x = 5.220153254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + x = 5.220153254 + 35 Combine like terms: -35 + 35 = 0 0 + x = 5.220153254 + 35 x = 5.220153254 + 35 Combine like terms: 5.220153254 + 35 = 40.220153254 x = 40.220153254 Simplifying x = 40.220153254

Subproblem 2

x + -35 = -5.220153254 Simplifying x + -35 = -5.220153254 Reorder the terms: -35 + x = -5.220153254 Solving -35 + x = -5.220153254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + x = -5.220153254 + 35 Combine like terms: -35 + 35 = 0 0 + x = -5.220153254 + 35 x = -5.220153254 + 35 Combine like terms: -5.220153254 + 35 = 29.779846746 x = 29.779846746 Simplifying x = 29.779846746

Solution

The solution to the problem is based on the solutions from the subproblems. x = {40.220153254, 29.779846746}

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