4X^2-X-15=0

Simple and best practice solution for 4X^2-X-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 4X^2-X-15=0 equation:


Simplifying
4X2 + -1X + -15 = 0

Reorder the terms:
-15 + -1X + 4X2 = 0

Solving
-15 + -1X + 4X2 = 0

Solving for variable 'X'.

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

Divide each side by '4'.
-3.75 + -0.25X + X2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + -0.25X + 3.75 + X2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + -0.25X + X2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + -0.25X + X2 = 0 + 3.75
-0.25X + X2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
-0.25X + X2 = 3.75

The X term is -0.25X.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25X + 0.015625 + X2 = 3.75 + 0.015625

Reorder the terms:
0.015625 + -0.25X + X2 = 3.75 + 0.015625

Combine like terms: 3.75 + 0.015625 = 3.765625
0.015625 + -0.25X + X2 = 3.765625

Factor a perfect square on the left side:
(X + -0.125)(X + -0.125) = 3.765625

Calculate the square root of the right side: 1.940521837

Break this problem into two subproblems by setting 
(X + -0.125) equal to 1.940521837 and -1.940521837.

Subproblem 1

X + -0.125 = 1.940521837 Simplifying X + -0.125 = 1.940521837 Reorder the terms: -0.125 + X = 1.940521837 Solving -0.125 + X = 1.940521837 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + X = 1.940521837 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + X = 1.940521837 + 0.125 X = 1.940521837 + 0.125 Combine like terms: 1.940521837 + 0.125 = 2.065521837 X = 2.065521837 Simplifying X = 2.065521837

Subproblem 2

X + -0.125 = -1.940521837 Simplifying X + -0.125 = -1.940521837 Reorder the terms: -0.125 + X = -1.940521837 Solving -0.125 + X = -1.940521837 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + X = -1.940521837 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + X = -1.940521837 + 0.125 X = -1.940521837 + 0.125 Combine like terms: -1.940521837 + 0.125 = -1.815521837 X = -1.815521837 Simplifying X = -1.815521837

Solution

The solution to the problem is based on the solutions from the subproblems. X = {2.065521837, -1.815521837}

See similar equations:

| -15;x+35=20 | | -2b-3-4=18 | | 6y+2x-3=12+10x-12y | | -2x-4(5)=-8 | | 6x-8=-18 | | 14m-3=2m+6 | | I+-19=-73 | | 7x/3=x/36-x/12 | | 0.50x+0.35(70)=34.5 | | -18+4y=2 | | 3p+4=33 | | x/5=x/6-1 | | 1-7y=-8 | | 5+v=-3 | | 10=d^2+3 | | z=19+3x+3y | | 5x-10=75 | | -5+u=9 | | 1/4x+3=16 | | 5+v=-6 | | 14z/14=12/14 | | (4x-2)+3(3x+5)=6x-1 | | (5m-6n)+(-2m-n)= | | 5x+4.3=9.8 | | -15+3x=7 | | -5x-23+3x=27 | | n*10+19=49 | | 24x=16 | | 2.5x+12=22 | | 6x-4(x-2)=-3+4x+7 | | 4x+6=4(x-9) | | x=3(45-12)+30 |

Equations solver categories