5x^2=9x+17

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Solution for 5x^2=9x+17 equation:


Simplifying
5x2 = 9x + 17

Reorder the terms:
5x2 = 17 + 9x

Solving
5x2 = 17 + 9x

Solving for variable 'x'.

Reorder the terms:
-17 + -9x + 5x2 = 17 + 9x + -17 + -9x

Reorder the terms:
-17 + -9x + 5x2 = 17 + -17 + 9x + -9x

Combine like terms: 17 + -17 = 0
-17 + -9x + 5x2 = 0 + 9x + -9x
-17 + -9x + 5x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
-17 + -9x + 5x2 = 0

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

Divide each side by '5'.
-3.4 + -1.8x + x2 = 0

Move the constant term to the right:

Add '3.4' to each side of the equation.
-3.4 + -1.8x + 3.4 + x2 = 0 + 3.4

Reorder the terms:
-3.4 + 3.4 + -1.8x + x2 = 0 + 3.4

Combine like terms: -3.4 + 3.4 = 0.0
0.0 + -1.8x + x2 = 0 + 3.4
-1.8x + x2 = 0 + 3.4

Combine like terms: 0 + 3.4 = 3.4
-1.8x + x2 = 3.4

The x term is -1.8x.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8x + 0.81 + x2 = 3.4 + 0.81

Reorder the terms:
0.81 + -1.8x + x2 = 3.4 + 0.81

Combine like terms: 3.4 + 0.81 = 4.21
0.81 + -1.8x + x2 = 4.21

Factor a perfect square on the left side:
(x + -0.9)(x + -0.9) = 4.21

Calculate the square root of the right side: 2.051828453

Break this problem into two subproblems by setting 
(x + -0.9) equal to 2.051828453 and -2.051828453.

Subproblem 1

x + -0.9 = 2.051828453 Simplifying x + -0.9 = 2.051828453 Reorder the terms: -0.9 + x = 2.051828453 Solving -0.9 + x = 2.051828453 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = 2.051828453 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = 2.051828453 + 0.9 x = 2.051828453 + 0.9 Combine like terms: 2.051828453 + 0.9 = 2.951828453 x = 2.951828453 Simplifying x = 2.951828453

Subproblem 2

x + -0.9 = -2.051828453 Simplifying x + -0.9 = -2.051828453 Reorder the terms: -0.9 + x = -2.051828453 Solving -0.9 + x = -2.051828453 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = -2.051828453 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = -2.051828453 + 0.9 x = -2.051828453 + 0.9 Combine like terms: -2.051828453 + 0.9 = -1.151828453 x = -1.151828453 Simplifying x = -1.151828453

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.951828453, -1.151828453}

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