4x^2-5x+4=15

Simple and best practice solution for 4x^2-5x+4=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 4x^2-5x+4=15 equation:


Simplifying
4x2 + -5x + 4 = 15

Reorder the terms:
4 + -5x + 4x2 = 15

Solving
4 + -5x + 4x2 = 15

Solving for variable 'x'.

Reorder the terms:
4 + -15 + -5x + 4x2 = 15 + -15

Combine like terms: 4 + -15 = -11
-11 + -5x + 4x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-11 + -5x + 4x2 = 0

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

Divide each side by '4'.
-2.75 + -1.25x + x2 = 0

Move the constant term to the right:

Add '2.75' to each side of the equation.
-2.75 + -1.25x + 2.75 + x2 = 0 + 2.75

Reorder the terms:
-2.75 + 2.75 + -1.25x + x2 = 0 + 2.75

Combine like terms: -2.75 + 2.75 = 0.00
0.00 + -1.25x + x2 = 0 + 2.75
-1.25x + x2 = 0 + 2.75

Combine like terms: 0 + 2.75 = 2.75
-1.25x + x2 = 2.75

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = 2.75 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = 2.75 + 0.390625

Combine like terms: 2.75 + 0.390625 = 3.140625
0.390625 + -1.25x + x2 = 3.140625

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 3.140625

Calculate the square root of the right side: 1.77218086

Break this problem into two subproblems by setting 
(x + -0.625) equal to 1.77218086 and -1.77218086.

Subproblem 1

x + -0.625 = 1.77218086 Simplifying x + -0.625 = 1.77218086 Reorder the terms: -0.625 + x = 1.77218086 Solving -0.625 + x = 1.77218086 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = 1.77218086 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 1.77218086 + 0.625 x = 1.77218086 + 0.625 Combine like terms: 1.77218086 + 0.625 = 2.39718086 x = 2.39718086 Simplifying x = 2.39718086

Subproblem 2

x + -0.625 = -1.77218086 Simplifying x + -0.625 = -1.77218086 Reorder the terms: -0.625 + x = -1.77218086 Solving -0.625 + x = -1.77218086 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = -1.77218086 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -1.77218086 + 0.625 x = -1.77218086 + 0.625 Combine like terms: -1.77218086 + 0.625 = -1.14718086 x = -1.14718086 Simplifying x = -1.14718086

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.39718086, -1.14718086}

See similar equations:

| (X-9)^1/3=-6 | | -x-squared+53x-196=0 | | 10=-1/3x | | 20x+2-[6(x-3)+6]= | | 4(y-3)=4y-3 | | 4x-3[x-2]=21 | | 5-2n=-7 | | e(2x+5)=8 | | r^3+7r^2-30r=0 | | P=12*2x | | H(t)=16t^2+1250 | | x^2*lnx-9*lnx=0 | | (7y^2-4y+2)+(-3y^2+6y+5)= | | 6b+3a=4 | | 1-3xln(x)-x=0 | | .4(5+x)=8 | | 2k^2+16x=-12 | | 4=2(3y+6) | | y^2=-50y | | .25X+15=30 | | 2n+5=-35 | | 6(y+3)=10y | | 4-x/5=1/5x | | 176-v=271 | | 2x^3+12x^2+11x=0 | | 6(y+3)=10xy | | .25X+2=30 | | g^2=40g | | 5cosx+3sinx=4 | | .5X+3=-29 | | 198=28-x | | 4d^2=-121-44d |

Equations solver categories