4x^2+3x=9

Simple and best practice solution for 4x^2+3x=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 4x^2+3x=9 equation:


Simplifying
4x2 + 3x = 9

Reorder the terms:
3x + 4x2 = 9

Solving
3x + 4x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + 3x + 4x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + 3x + 4x2 = 0

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

Divide each side by '4'.
-2.25 + 0.75x + x2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + 0.75x + 2.25 + x2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + 0.75x + x2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + 0.75x + x2 = 0 + 2.25
0.75x + x2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
0.75x + x2 = 2.25

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 2.25 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 2.25 + 0.140625

Combine like terms: 2.25 + 0.140625 = 2.390625
0.140625 + 0.75x + x2 = 2.390625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 2.390625

Calculate the square root of the right side: 1.54616461

Break this problem into two subproblems by setting 
(x + 0.375) equal to 1.54616461 and -1.54616461.

Subproblem 1

x + 0.375 = 1.54616461 Simplifying x + 0.375 = 1.54616461 Reorder the terms: 0.375 + x = 1.54616461 Solving 0.375 + x = 1.54616461 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 1.54616461 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 1.54616461 + -0.375 x = 1.54616461 + -0.375 Combine like terms: 1.54616461 + -0.375 = 1.17116461 x = 1.17116461 Simplifying x = 1.17116461

Subproblem 2

x + 0.375 = -1.54616461 Simplifying x + 0.375 = -1.54616461 Reorder the terms: 0.375 + x = -1.54616461 Solving 0.375 + x = -1.54616461 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -1.54616461 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -1.54616461 + -0.375 x = -1.54616461 + -0.375 Combine like terms: -1.54616461 + -0.375 = -1.92116461 x = -1.92116461 Simplifying x = -1.92116461

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.17116461, -1.92116461}

See similar equations:

| 4[6-(-5x-6)]=40x+72 | | 3(w+7)=-3(7w-1)+9w | | 7c*6e= | | 8x+10y=48 | | 5a/4-2a/5=17/2 | | 2(x-3)-3=-4(-5x+3)-3x | | 3x+7-5(x-1)=5x+4 | | 8r+10y=48 | | 8x-9-6x+14=11x-9-10+13 | | -7.24=x/4+3 | | a*2/(4+6)=10 | | 15x^2+19m+6=0 | | -5x+15.8=3.3 | | 3-4(5-7)=z | | Z+6/8=Z-5/7 | | -3(3v-7)+7v=6+3(2v-1) | | -1.1+u/2=-13.9 | | 6=-19+t | | 7(x+4)=-3(x+2)+4 | | 5+2u=19 | | .3x+2=2.6 | | 25=-14+y | | -3+4(-2+7)= | | -24=w/4-4 | | (3)/(x^2-2x)-(2)/(x)=(8)/(x-2) | | 8+6v=6v-6+7v | | 3y-2+3(2y+1)=-3(y+3) | | 58=-x+171 | | y-(-9)=(-14/3)(x-(-9)) | | x/37+25=50 | | 7x+3=2x-17 | | 240=-w+30 |

Equations solver categories