4x^2-15x+8=0

Simple and best practice solution for 4x^2-15x+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 4x^2-15x+8=0 equation:


Simplifying
4x2 + -15x + 8 = 0

Reorder the terms:
8 + -15x + 4x2 = 0

Solving
8 + -15x + 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'.
2 + -3.75x + x2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -3.75x + -2 + x2 = 0 + -2

Reorder the terms:
2 + -2 + -3.75x + x2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -3.75x + x2 = 0 + -2
-3.75x + x2 = 0 + -2

Combine like terms: 0 + -2 = -2
-3.75x + x2 = -2

The x term is -3.75x.  Take half its coefficient (-1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
-3.75x + 3.515625 + x2 = -2 + 3.515625

Reorder the terms:
3.515625 + -3.75x + x2 = -2 + 3.515625

Combine like terms: -2 + 3.515625 = 1.515625
3.515625 + -3.75x + x2 = 1.515625

Factor a perfect square on the left side:
(x + -1.875)(x + -1.875) = 1.515625

Calculate the square root of the right side: 1.231107225

Break this problem into two subproblems by setting 
(x + -1.875) equal to 1.231107225 and -1.231107225.

Subproblem 1

x + -1.875 = 1.231107225 Simplifying x + -1.875 = 1.231107225 Reorder the terms: -1.875 + x = 1.231107225 Solving -1.875 + x = 1.231107225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = 1.231107225 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 1.231107225 + 1.875 x = 1.231107225 + 1.875 Combine like terms: 1.231107225 + 1.875 = 3.106107225 x = 3.106107225 Simplifying x = 3.106107225

Subproblem 2

x + -1.875 = -1.231107225 Simplifying x + -1.875 = -1.231107225 Reorder the terms: -1.875 + x = -1.231107225 Solving -1.875 + x = -1.231107225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = -1.231107225 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -1.231107225 + 1.875 x = -1.231107225 + 1.875 Combine like terms: -1.231107225 + 1.875 = 0.643892775 x = 0.643892775 Simplifying x = 0.643892775

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.106107225, 0.643892775}

See similar equations:

| 2x^3-3x^2-12x-1=0 | | 52-2x=7x+18 | | x-2x-4x= | | 67-3x=10x+16 | | 9(x-1)=0.9 | | -16t^2+38.4t+3.5=0 | | 8m+14=9 | | 8(a+9)=122.4 | | 13a-10=-22 | | -16t^2+38.4t+3.5=h | | x^4=6 | | -2.2=2c-3 | | 2x+61=7x+11 | | x^3=6 | | 5(2x-9)-2x-17=6(x+9) | | 6e-2=41.8 | | 6p=51.6 | | -5(m+6)=3(3m+18) | | 4(x)=32 | | 7y+14-4y=-37 | | 4(a+5)=56 | | -2(c-16)=88 | | 5=3c-7 | | 4e-8=4 | | 7w+27=3w-17 | | 34*0.5= | | 10-9x=-125 | | 3x-25=x+33 | | 5y-16=74 | | 5x-13=62 | | 8+8x=24 | | z-40=67 |

Equations solver categories