20=0.04x^2-0.09x+1.2

Simple and best practice solution for 20=0.04x^2-0.09x+1.2 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 20=0.04x^2-0.09x+1.2 equation:


Simplifying
20 = 0.04x2 + -0.09x + 1.2

Reorder the terms:
20 = 1.2 + -0.09x + 0.04x2

Solving
20 = 1.2 + -0.09x + 0.04x2

Solving for variable 'x'.

Combine like terms: 20 + -1.2 = 18.8
18.8 + 0.09x + -0.04x2 = 1.2 + -0.09x + 0.04x2 + -1.2 + 0.09x + -0.04x2

Reorder the terms:
18.8 + 0.09x + -0.04x2 = 1.2 + -1.2 + -0.09x + 0.09x + 0.04x2 + -0.04x2

Combine like terms: 1.2 + -1.2 = 0.0
18.8 + 0.09x + -0.04x2 = 0.0 + -0.09x + 0.09x + 0.04x2 + -0.04x2
18.8 + 0.09x + -0.04x2 = -0.09x + 0.09x + 0.04x2 + -0.04x2

Combine like terms: -0.09x + 0.09x = 0.00
18.8 + 0.09x + -0.04x2 = 0.00 + 0.04x2 + -0.04x2
18.8 + 0.09x + -0.04x2 = 0.04x2 + -0.04x2

Combine like terms: 0.04x2 + -0.04x2 = 0.00
18.8 + 0.09x + -0.04x2 = 0.00

Begin completing the square.  Divide all terms by
-0.04 the coefficient of the squared term: 

Divide each side by '-0.04'.
-470 + -2.25x + x2 = 0

Move the constant term to the right:

Add '470' to each side of the equation.
-470 + -2.25x + 470 + x2 = 0 + 470

Reorder the terms:
-470 + 470 + -2.25x + x2 = 0 + 470

Combine like terms: -470 + 470 = 0
0 + -2.25x + x2 = 0 + 470
-2.25x + x2 = 0 + 470

Combine like terms: 0 + 470 = 470
-2.25x + x2 = 470

The x term is -2.25x.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25x + 1.265625 + x2 = 470 + 1.265625

Reorder the terms:
1.265625 + -2.25x + x2 = 470 + 1.265625

Combine like terms: 470 + 1.265625 = 471.265625
1.265625 + -2.25x + x2 = 471.265625

Factor a perfect square on the left side:
(x + -1.125)(x + -1.125) = 471.265625

Calculate the square root of the right side: 21.708653229

Break this problem into two subproblems by setting 
(x + -1.125) equal to 21.708653229 and -21.708653229.

Subproblem 1

x + -1.125 = 21.708653229 Simplifying x + -1.125 = 21.708653229 Reorder the terms: -1.125 + x = 21.708653229 Solving -1.125 + x = 21.708653229 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = 21.708653229 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = 21.708653229 + 1.125 x = 21.708653229 + 1.125 Combine like terms: 21.708653229 + 1.125 = 22.833653229 x = 22.833653229 Simplifying x = 22.833653229

Subproblem 2

x + -1.125 = -21.708653229 Simplifying x + -1.125 = -21.708653229 Reorder the terms: -1.125 + x = -21.708653229 Solving -1.125 + x = -21.708653229 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = -21.708653229 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = -21.708653229 + 1.125 x = -21.708653229 + 1.125 Combine like terms: -21.708653229 + 1.125 = -20.583653229 x = -20.583653229 Simplifying x = -20.583653229

Solution

The solution to the problem is based on the solutions from the subproblems. x = {22.833653229, -20.583653229}

See similar equations:

| 240=1.8(k-273.15)+32 | | 4-3(4p-1)=-8 | | 3m-7-5m=-13 | | 8.3c=163.51 | | 40x^2+68x+12=0 | | x+111=105 | | 25+2x=189 | | 150m-100m+47500=50000-200m | | 3r-7+2=25 | | 32+(273.15-k)1.8=f | | 3-8=x | | -4(2y-5)=44 | | 100=-16t^2-29T+100 | | -18-6d=18 | | 2r^2+5r+3=0 | | x+66=60 | | y-7=-11 | | 8g+6(g-2)=-10(g-4)-2g | | 17=-9m-1+6m | | 19-h-h=-3 | | 4y-4x=1 | | 3(3m-21)=2(3m+3) | | 2/5=7 | | 5x-(3x+3)=11 | | -17x-(10-x)=-58 | | p=2(2)+2(36) | | 5+8=3c | | 3(x-3)+16=4x+25 | | 40x-1=9 | | 4p+1.1=2600 | | 2.5x-1=9 | | 4p*1.1=2600 |

Equations solver categories