5x^2-2x=9

Simple and best practice solution for 5x^2-2x=9 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 5x^2-2x=9 equation:


Simplifying
5x2 + -2x = 9

Reorder the terms:
-2x + 5x2 = 9

Solving
-2x + 5x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + -2x + 5x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -2x + 5x2 = 0

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

Divide each side by '5'.
-1.8 + -0.4x + x2 = 0

Move the constant term to the right:

Add '1.8' to each side of the equation.
-1.8 + -0.4x + 1.8 + x2 = 0 + 1.8

Reorder the terms:
-1.8 + 1.8 + -0.4x + x2 = 0 + 1.8

Combine like terms: -1.8 + 1.8 = 0.0
0.0 + -0.4x + x2 = 0 + 1.8
-0.4x + x2 = 0 + 1.8

Combine like terms: 0 + 1.8 = 1.8
-0.4x + x2 = 1.8

The x term is -0.4x.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4x + 0.04 + x2 = 1.8 + 0.04

Reorder the terms:
0.04 + -0.4x + x2 = 1.8 + 0.04

Combine like terms: 1.8 + 0.04 = 1.84
0.04 + -0.4x + x2 = 1.84

Factor a perfect square on the left side:
(x + -0.2)(x + -0.2) = 1.84

Calculate the square root of the right side: 1.356465997

Break this problem into two subproblems by setting 
(x + -0.2) equal to 1.356465997 and -1.356465997.

Subproblem 1

x + -0.2 = 1.356465997 Simplifying x + -0.2 = 1.356465997 Reorder the terms: -0.2 + x = 1.356465997 Solving -0.2 + x = 1.356465997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = 1.356465997 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = 1.356465997 + 0.2 x = 1.356465997 + 0.2 Combine like terms: 1.356465997 + 0.2 = 1.556465997 x = 1.556465997 Simplifying x = 1.556465997

Subproblem 2

x + -0.2 = -1.356465997 Simplifying x + -0.2 = -1.356465997 Reorder the terms: -0.2 + x = -1.356465997 Solving -0.2 + x = -1.356465997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = -1.356465997 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = -1.356465997 + 0.2 x = -1.356465997 + 0.2 Combine like terms: -1.356465997 + 0.2 = -1.156465997 x = -1.156465997 Simplifying x = -1.156465997

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.556465997, -1.156465997}

See similar equations:

| 2.7q-5.2-4.8q=-3.1q-5.1 | | a+4=10 | | 13x+9-4=12x-4 | | 5*v^2=8*v | | -4y+1=-5y+9 | | 6y+8n-20y=8n+9y-(-15y) | | -5y=-85 | | 19x=4(5x-56) | | 12+x=-4 | | -48=13n+14 | | 5.1c-7.2=8.1 | | 3x^2+240=0 | | -6y=7 | | -4x+7=14 | | 37+35=9s+3s | | -3x=72 | | k+17=19 | | -2(171+2x)=436 | | 12=3.1y+59.3 | | 7+9= | | 22x+27=-33x-6 | | 6+-m+6+-8= | | X-29=-34 | | 5(x-4)=-2x+22 | | 0=96+80t-16t^2 | | 14x-6=7x+8 | | -32+x=25 | | 12=3.1y+-59.3 | | z-30=-17 | | 4a+0.2=5 | | .5m+3=.2m+5 | | 12=12+-59.3 |

Equations solver categories