3x^2+11x=90

Simple and best practice solution for 3x^2+11x=90 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 3x^2+11x=90 equation:


Simplifying
3x2 + 11x = 90

Reorder the terms:
11x + 3x2 = 90

Solving
11x + 3x2 = 90

Solving for variable 'x'.

Reorder the terms:
-90 + 11x + 3x2 = 90 + -90

Combine like terms: 90 + -90 = 0
-90 + 11x + 3x2 = 0

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

Divide each side by '3'.
-30 + 3.666666667x + x2 = 0

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + 3.666666667x + 30 + x2 = 0 + 30

Reorder the terms:
-30 + 30 + 3.666666667x + x2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + 3.666666667x + x2 = 0 + 30
3.666666667x + x2 = 0 + 30

Combine like terms: 0 + 30 = 30
3.666666667x + x2 = 30

The x term is 3.666666667x.  Take half its coefficient (1.833333334).
Square it (3.361111114) and add it to both sides.

Add '3.361111114' to each side of the equation.
3.666666667x + 3.361111114 + x2 = 30 + 3.361111114

Reorder the terms:
3.361111114 + 3.666666667x + x2 = 30 + 3.361111114

Combine like terms: 30 + 3.361111114 = 33.361111114
3.361111114 + 3.666666667x + x2 = 33.361111114

Factor a perfect square on the left side:
(x + 1.833333334)(x + 1.833333334) = 33.361111114

Calculate the square root of the right side: 5.775907817

Break this problem into two subproblems by setting 
(x + 1.833333334) equal to 5.775907817 and -5.775907817.

Subproblem 1

x + 1.833333334 = 5.775907817 Simplifying x + 1.833333334 = 5.775907817 Reorder the terms: 1.833333334 + x = 5.775907817 Solving 1.833333334 + x = 5.775907817 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.833333334' to each side of the equation. 1.833333334 + -1.833333334 + x = 5.775907817 + -1.833333334 Combine like terms: 1.833333334 + -1.833333334 = 0.000000000 0.000000000 + x = 5.775907817 + -1.833333334 x = 5.775907817 + -1.833333334 Combine like terms: 5.775907817 + -1.833333334 = 3.942574483 x = 3.942574483 Simplifying x = 3.942574483

Subproblem 2

x + 1.833333334 = -5.775907817 Simplifying x + 1.833333334 = -5.775907817 Reorder the terms: 1.833333334 + x = -5.775907817 Solving 1.833333334 + x = -5.775907817 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.833333334' to each side of the equation. 1.833333334 + -1.833333334 + x = -5.775907817 + -1.833333334 Combine like terms: 1.833333334 + -1.833333334 = 0.000000000 0.000000000 + x = -5.775907817 + -1.833333334 x = -5.775907817 + -1.833333334 Combine like terms: -5.775907817 + -1.833333334 = -7.609241151 x = -7.609241151 Simplifying x = -7.609241151

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.942574483, -7.609241151}

See similar equations:

| -11+10(p+10)=45(2p+11) | | 3y^2+14y+11=0 | | (x^3/xy^4)(y/x)^5 | | 15x+7y=5 | | x*x-8/9*x | | -3D+2=20 | | 2x=1y+10 | | f(x)=x^3-2x^2+20 | | 12/x^2 | | 5a+8b=-2 | | 1/t-2=t/8 | | M-1=3 | | 100+150x=2200 | | x*x-(8/9)x | | 2z+8=20 | | 15x^2y= | | 3v+16=5v | | X*x-8/9x | | 10-(2n-7)=3-3n | | -7-t=10-4t+10 | | 50=(7x)-(3x+250) | | x^2+3x-4=10 | | -16t^2+42t+6=0 | | 3y+13=22 | | 3(y-9)=2(y-5) | | -10m+3=-8+m | | log(4x+1)=log(x+2) | | s*5-16=114 | | -16t^2+42t*2+6=0 | | 8j+10=9j | | y=-5x^2-30x-25 | | Y=2x^2+px+q |

Equations solver categories