5x^2+3x-90=0

Simple and best practice solution for 5x^2+3x-90=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 5x^2+3x-90=0 equation:


Simplifying
5x2 + 3x + -90 = 0

Reorder the terms:
-90 + 3x + 5x2 = 0

Solving
-90 + 3x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-18 + 0.6x + x2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 0.6x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + 0.6x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 0.6x + x2 = 0 + 18
0.6x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
0.6x + x2 = 18

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 18 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 18 + 0.09

Combine like terms: 18 + 0.09 = 18.09
0.09 + 0.6x + x2 = 18.09

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 18.09

Calculate the square root of the right side: 4.253234064

Break this problem into two subproblems by setting 
(x + 0.3) equal to 4.253234064 and -4.253234064.

Subproblem 1

x + 0.3 = 4.253234064 Simplifying x + 0.3 = 4.253234064 Reorder the terms: 0.3 + x = 4.253234064 Solving 0.3 + x = 4.253234064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 4.253234064 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 4.253234064 + -0.3 x = 4.253234064 + -0.3 Combine like terms: 4.253234064 + -0.3 = 3.953234064 x = 3.953234064 Simplifying x = 3.953234064

Subproblem 2

x + 0.3 = -4.253234064 Simplifying x + 0.3 = -4.253234064 Reorder the terms: 0.3 + x = -4.253234064 Solving 0.3 + x = -4.253234064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -4.253234064 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -4.253234064 + -0.3 x = -4.253234064 + -0.3 Combine like terms: -4.253234064 + -0.3 = -4.553234064 x = -4.553234064 Simplifying x = -4.553234064

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.953234064, -4.553234064}

See similar equations:

| 2(3x-5)-6=14 | | (x-3)=2(x-3) | | 2/5x=4/9 | | 6x-26=58+4x | | 3v^2-51v+90=0 | | 4x^3-12x^2+5=0 | | f(x)=lx+5l | | 5(31/20)-5y=8 | | 2(x-3)=(x-3) | | 8x^7-7x^8=.75 | | 9z^2-36z+34= | | 30x^2-5x^2= | | 4x^3-12x^2=-5 | | 3/4×-12= | | -6x+2y=40 | | x/0.24=0.3/0.36 | | 9x+1=7x+47 | | 3/4×-12 | | 2x+4.6=8.4 | | 4x+104=6x+46 | | y=lx+4l | | y=x+4l | | 4x^3-3x^2+5=0 | | y=-x^2-14x-45 | | 6(80-4y)+5y=94 | | 2x+8y=330 | | S=-241t^7+1060t^6-1870t^5-737t^3+144t^2-2.43t | | 132=2*2*3*11 | | 4x^4+7x-x^4=0 | | 5p-22=-30+9p | | 8(93-4y)+12y=364 | | -7(0.1x+0.4)-1.5=-0.1 |

Equations solver categories