-4.9x^2+6.5x+10=0

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Solution for -4.9x^2+6.5x+10=0 equation:


Simplifying
-4.9x2 + 6.5x + 10 = 0

Reorder the terms:
10 + 6.5x + -4.9x2 = 0

Solving
10 + 6.5x + -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'.
-2.040816327 + -1.326530612x + x2 = 0

Move the constant term to the right:

Add '2.040816327' to each side of the equation.
-2.040816327 + -1.326530612x + 2.040816327 + x2 = 0 + 2.040816327

Reorder the terms:
-2.040816327 + 2.040816327 + -1.326530612x + x2 = 0 + 2.040816327

Combine like terms: -2.040816327 + 2.040816327 = 0.000000000
0.000000000 + -1.326530612x + x2 = 0 + 2.040816327
-1.326530612x + x2 = 0 + 2.040816327

Combine like terms: 0 + 2.040816327 = 2.040816327
-1.326530612x + x2 = 2.040816327

The x term is -1.326530612x.  Take half its coefficient (-0.663265306).
Square it (0.4399208661) and add it to both sides.

Add '0.4399208661' to each side of the equation.
-1.326530612x + 0.4399208661 + x2 = 2.040816327 + 0.4399208661

Reorder the terms:
0.4399208661 + -1.326530612x + x2 = 2.040816327 + 0.4399208661

Combine like terms: 2.040816327 + 0.4399208661 = 2.4807371931
0.4399208661 + -1.326530612x + x2 = 2.4807371931

Factor a perfect square on the left side:
(x + -0.663265306)(x + -0.663265306) = 2.4807371931

Calculate the square root of the right side: 1.575035616

Break this problem into two subproblems by setting 
(x + -0.663265306) equal to 1.575035616 and -1.575035616.

Subproblem 1

x + -0.663265306 = 1.575035616 Simplifying x + -0.663265306 = 1.575035616 Reorder the terms: -0.663265306 + x = 1.575035616 Solving -0.663265306 + x = 1.575035616 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.663265306' to each side of the equation. -0.663265306 + 0.663265306 + x = 1.575035616 + 0.663265306 Combine like terms: -0.663265306 + 0.663265306 = 0.000000000 0.000000000 + x = 1.575035616 + 0.663265306 x = 1.575035616 + 0.663265306 Combine like terms: 1.575035616 + 0.663265306 = 2.238300922 x = 2.238300922 Simplifying x = 2.238300922

Subproblem 2

x + -0.663265306 = -1.575035616 Simplifying x + -0.663265306 = -1.575035616 Reorder the terms: -0.663265306 + x = -1.575035616 Solving -0.663265306 + x = -1.575035616 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.663265306' to each side of the equation. -0.663265306 + 0.663265306 + x = -1.575035616 + 0.663265306 Combine like terms: -0.663265306 + 0.663265306 = 0.000000000 0.000000000 + x = -1.575035616 + 0.663265306 x = -1.575035616 + 0.663265306 Combine like terms: -1.575035616 + 0.663265306 = -0.91177031 x = -0.91177031 Simplifying x = -0.91177031

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.238300922, -0.91177031}

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