2x^2-17x-15=0

Simple and best practice solution for 2x^2-17x-15=0 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 2x^2-17x-15=0 equation:


Simplifying
2x2 + -17x + -15 = 0

Reorder the terms:
-15 + -17x + 2x2 = 0

Solving
-15 + -17x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-7.5 + -8.5x + x2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + -8.5x + 7.5 + x2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + -8.5x + x2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + -8.5x + x2 = 0 + 7.5
-8.5x + x2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
-8.5x + x2 = 7.5

The x term is -8.5x.  Take half its coefficient (-4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
-8.5x + 18.0625 + x2 = 7.5 + 18.0625

Reorder the terms:
18.0625 + -8.5x + x2 = 7.5 + 18.0625

Combine like terms: 7.5 + 18.0625 = 25.5625
18.0625 + -8.5x + x2 = 25.5625

Factor a perfect square on the left side:
(x + -4.25)(x + -4.25) = 25.5625

Calculate the square root of the right side: 5.055937104

Break this problem into two subproblems by setting 
(x + -4.25) equal to 5.055937104 and -5.055937104.

Subproblem 1

x + -4.25 = 5.055937104 Simplifying x + -4.25 = 5.055937104 Reorder the terms: -4.25 + x = 5.055937104 Solving -4.25 + x = 5.055937104 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + x = 5.055937104 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + x = 5.055937104 + 4.25 x = 5.055937104 + 4.25 Combine like terms: 5.055937104 + 4.25 = 9.305937104 x = 9.305937104 Simplifying x = 9.305937104

Subproblem 2

x + -4.25 = -5.055937104 Simplifying x + -4.25 = -5.055937104 Reorder the terms: -4.25 + x = -5.055937104 Solving -4.25 + x = -5.055937104 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + x = -5.055937104 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + x = -5.055937104 + 4.25 x = -5.055937104 + 4.25 Combine like terms: -5.055937104 + 4.25 = -0.805937104 x = -0.805937104 Simplifying x = -0.805937104

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.305937104, -0.805937104}

See similar equations:

| -2x+7+7x=-8 | | -8(3x-4)=4(5x-50)-3 | | 10x^4+9x^2+1=0 | | (X+25)=(2x-2) | | -(-6+22n)-16= | | -2x-34=-6(x+9) | | 2y+6=2 | | 10x-11=79-5x | | 31w-4w=10w+10 | | 2x-10y=-2 | | (X+-24)=(2x-2) | | x+0.40x=56 | | -8x+4(x-6)=-16 | | 14x+6=x+16 | | 17=g-15 | | ax+7=3x+a | | 4x+15=37 | | 8(x-3)+8=5x | | -8x+9=-10x-3 | | 9-6x=8-7x | | 9x+1-7x=-15 | | (x-9)(9-0)=0 | | x+0.40x=36 | | 17x+(x-31)=2(5x-50)-3 | | m^2-9x=m-3 | | 13x+8.5=x+16 | | 16-24=2x | | 4x+112=6x-32 | | 27x+54=x^2+16x+64 | | -14=4x | | -5+13x=64 | | 2ax^2-x+3=0 |

Equations solver categories