-4.9x^2+1.5x+17=0

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Solution for -4.9x^2+1.5x+17=0 equation:


Simplifying
-4.9x2 + 1.5x + 17 = 0

Reorder the terms:
17 + 1.5x + -4.9x2 = 0

Solving
17 + 1.5x + -4.9x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-4.9 the coefficient of the squared term: 

Divide each side by '-4.9'.
-3.469387755 + -0.306122449x + x2 = 0

Move the constant term to the right:

Add '3.469387755' to each side of the equation.
-3.469387755 + -0.306122449x + 3.469387755 + x2 = 0 + 3.469387755

Reorder the terms:
-3.469387755 + 3.469387755 + -0.306122449x + x2 = 0 + 3.469387755

Combine like terms: -3.469387755 + 3.469387755 = 0.000000000
0.000000000 + -0.306122449x + x2 = 0 + 3.469387755
-0.306122449x + x2 = 0 + 3.469387755

Combine like terms: 0 + 3.469387755 = 3.469387755
-0.306122449x + x2 = 3.469387755

The x term is -0.306122449x.  Take half its coefficient (-0.1530612245).
Square it (0.02342773845) and add it to both sides.

Add '0.02342773845' to each side of the equation.
-0.306122449x + 0.02342773845 + x2 = 3.469387755 + 0.02342773845

Reorder the terms:
0.02342773845 + -0.306122449x + x2 = 3.469387755 + 0.02342773845

Combine like terms: 3.469387755 + 0.02342773845 = 3.49281549345
0.02342773845 + -0.306122449x + x2 = 3.49281549345

Factor a perfect square on the left side:
(x + -0.1530612245)(x + -0.1530612245) = 3.49281549345

Calculate the square root of the right side: 1.868907567

Break this problem into two subproblems by setting 
(x + -0.1530612245) equal to 1.868907567 and -1.868907567.

Subproblem 1

x + -0.1530612245 = 1.868907567 Simplifying x + -0.1530612245 = 1.868907567 Reorder the terms: -0.1530612245 + x = 1.868907567 Solving -0.1530612245 + x = 1.868907567 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1530612245' to each side of the equation. -0.1530612245 + 0.1530612245 + x = 1.868907567 + 0.1530612245 Combine like terms: -0.1530612245 + 0.1530612245 = 0.0000000000 0.0000000000 + x = 1.868907567 + 0.1530612245 x = 1.868907567 + 0.1530612245 Combine like terms: 1.868907567 + 0.1530612245 = 2.0219687915 x = 2.0219687915 Simplifying x = 2.0219687915

Subproblem 2

x + -0.1530612245 = -1.868907567 Simplifying x + -0.1530612245 = -1.868907567 Reorder the terms: -0.1530612245 + x = -1.868907567 Solving -0.1530612245 + x = -1.868907567 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1530612245' to each side of the equation. -0.1530612245 + 0.1530612245 + x = -1.868907567 + 0.1530612245 Combine like terms: -0.1530612245 + 0.1530612245 = 0.0000000000 0.0000000000 + x = -1.868907567 + 0.1530612245 x = -1.868907567 + 0.1530612245 Combine like terms: -1.868907567 + 0.1530612245 = -1.7158463425 x = -1.7158463425 Simplifying x = -1.7158463425

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.0219687915, -1.7158463425}

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