15x^2+3x-8=0

Simple and best practice solution for 15x^2+3x-8=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 15x^2+3x-8=0 equation:


Simplifying
15x2 + 3x + -8 = 0

Reorder the terms:
-8 + 3x + 15x2 = 0

Solving
-8 + 3x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
-0.5333333333 + 0.2x + x2 = 0

Move the constant term to the right:

Add '0.5333333333' to each side of the equation.
-0.5333333333 + 0.2x + 0.5333333333 + x2 = 0 + 0.5333333333

Reorder the terms:
-0.5333333333 + 0.5333333333 + 0.2x + x2 = 0 + 0.5333333333

Combine like terms: -0.5333333333 + 0.5333333333 = 0.0000000000
0.0000000000 + 0.2x + x2 = 0 + 0.5333333333
0.2x + x2 = 0 + 0.5333333333

Combine like terms: 0 + 0.5333333333 = 0.5333333333
0.2x + x2 = 0.5333333333

The x term is 0.2x.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2x + 0.01 + x2 = 0.5333333333 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 0.5333333333 + 0.01

Combine like terms: 0.5333333333 + 0.01 = 0.5433333333
0.01 + 0.2x + x2 = 0.5433333333

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 0.5433333333

Calculate the square root of the right side: 0.73711148

Break this problem into two subproblems by setting 
(x + 0.1) equal to 0.73711148 and -0.73711148.

Subproblem 1

x + 0.1 = 0.73711148 Simplifying x + 0.1 = 0.73711148 Reorder the terms: 0.1 + x = 0.73711148 Solving 0.1 + x = 0.73711148 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = 0.73711148 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 0.73711148 + -0.1 x = 0.73711148 + -0.1 Combine like terms: 0.73711148 + -0.1 = 0.63711148 x = 0.63711148 Simplifying x = 0.63711148

Subproblem 2

x + 0.1 = -0.73711148 Simplifying x + 0.1 = -0.73711148 Reorder the terms: 0.1 + x = -0.73711148 Solving 0.1 + x = -0.73711148 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = -0.73711148 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -0.73711148 + -0.1 x = -0.73711148 + -0.1 Combine like terms: -0.73711148 + -0.1 = -0.83711148 x = -0.83711148 Simplifying x = -0.83711148

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.63711148, -0.83711148}

See similar equations:

| 9x=342 | | X^4+5x^3+4x^2-10x-12=0 | | 4x=x^2-110 | | x+(3x)+(6x-5)=180 | | 2x-15=4x+2 | | 2(6+2x)=8 | | 4x-3+7x=30 | | -7x-3y=9findslope | | 2(5x+3)=6x-6 | | 12x^3y^2-8xy^4-9x^2y/6x^2y^2 | | 2h+6(h+3)=-14 | | K^2=50-5k | | .33x+2=19 | | 1/4x-8=5/8x | | 9=5.5+x(10.5-5.5) | | 64x^2-48x+9=(8x-3) | | n^2+12n+19=-27 | | 0.50x+0.90x=0.80 | | -3(-4+3y)+5y=-8-(-12) | | 9p-8p=-3+11 | | 50x+90x=80 | | 600000=X-(X*0.35) | | 10x^2-49x-33= | | K^2=50-k | | 5(x-1)=2x+7 | | x^2-6x+2x+120=180 | | 600000=X-X(.035) | | (3x+2)(3x+2)=49 | | x+11=-8x+29 | | 2y+4(2-y)=2 | | r^3s^4t/r^3s^2t^4 | | 4x-3-8x+1=-5x+9 |

Equations solver categories