8x^2-3x=15

Simple and best practice solution for 8x^2-3x=15 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 8x^2-3x=15 equation:


Simplifying
8x2 + -3x = 15

Reorder the terms:
-3x + 8x2 = 15

Solving
-3x + 8x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + -3x + 8x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + -3x + 8x2 = 0

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

Divide each side by '8'.
-1.875 + -0.375x + x2 = 0

Move the constant term to the right:

Add '1.875' to each side of the equation.
-1.875 + -0.375x + 1.875 + x2 = 0 + 1.875

Reorder the terms:
-1.875 + 1.875 + -0.375x + x2 = 0 + 1.875

Combine like terms: -1.875 + 1.875 = 0.000
0.000 + -0.375x + x2 = 0 + 1.875
-0.375x + x2 = 0 + 1.875

Combine like terms: 0 + 1.875 = 1.875
-0.375x + x2 = 1.875

The x term is -0.375x.  Take half its coefficient (-0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
-0.375x + 0.03515625 + x2 = 1.875 + 0.03515625

Reorder the terms:
0.03515625 + -0.375x + x2 = 1.875 + 0.03515625

Combine like terms: 1.875 + 0.03515625 = 1.91015625
0.03515625 + -0.375x + x2 = 1.91015625

Factor a perfect square on the left side:
(x + -0.1875)(x + -0.1875) = 1.91015625

Calculate the square root of the right side: 1.382084024

Break this problem into two subproblems by setting 
(x + -0.1875) equal to 1.382084024 and -1.382084024.

Subproblem 1

x + -0.1875 = 1.382084024 Simplifying x + -0.1875 = 1.382084024 Reorder the terms: -0.1875 + x = 1.382084024 Solving -0.1875 + x = 1.382084024 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + x = 1.382084024 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + x = 1.382084024 + 0.1875 x = 1.382084024 + 0.1875 Combine like terms: 1.382084024 + 0.1875 = 1.569584024 x = 1.569584024 Simplifying x = 1.569584024

Subproblem 2

x + -0.1875 = -1.382084024 Simplifying x + -0.1875 = -1.382084024 Reorder the terms: -0.1875 + x = -1.382084024 Solving -0.1875 + x = -1.382084024 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + x = -1.382084024 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + x = -1.382084024 + 0.1875 x = -1.382084024 + 0.1875 Combine like terms: -1.382084024 + 0.1875 = -1.194584024 x = -1.194584024 Simplifying x = -1.194584024

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.569584024, -1.194584024}

See similar equations:

| 2-3(x+4)=7x+4 | | 44x+6x=30 | | 7/10x=35 | | 5x^2(x^3+2x-4)=0 | | 2/(2t+6)=3/(t-1) | | 2.1x+3.6=-4.8 | | log(5)4+log(5)(x-3)=log(5)33 | | 1/22= | | 8x+17=77+3x | | 5y-4=20 | | 4x+19=63 | | factoring(2x+3)(3x-7)=0 | | 6(x-5)-(6x+30)=0 | | -2y+10=-2(3y+7) | | 2.1x+3.6=4.8 | | -21k-5=22 | | 4z+1/6=5z+5/6 | | 135=l-3+2w | | 4+ln(x+1)=2 | | 12.2=(-8.40) | | 12t+24=30 | | 135=2l-3+w | | log(6)-2x-log(6)2=2 | | 8x=-28 | | jw-9=22 | | y=-16t^2+31t+s | | 75=-18n-15 | | y=-16t^2+31t+1 | | 2(5+6m)+16=-90 | | 4p+32/3=p-4 | | 7(9+1)-3a=5+4(29-1) | | .50x+.15(50)=35.5 |

Equations solver categories