4x^2+7x-12=0

Simple and best practice solution for 4x^2+7x-12=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 4x^2+7x-12=0 equation:


Simplifying
4x2 + 7x + -12 = 0

Reorder the terms:
-12 + 7x + 4x2 = 0

Solving
-12 + 7x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-3 + 1.75x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 1.75x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 1.75x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 1.75x + x2 = 0 + 3
1.75x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
1.75x + x2 = 3

The x term is 1.75x.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75x + 0.765625 + x2 = 3 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = 3 + 0.765625

Combine like terms: 3 + 0.765625 = 3.765625
0.765625 + 1.75x + x2 = 3.765625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 3.765625

Calculate the square root of the right side: 1.940521837

Break this problem into two subproblems by setting 
(x + 0.875) equal to 1.940521837 and -1.940521837.

Subproblem 1

x + 0.875 = 1.940521837 Simplifying x + 0.875 = 1.940521837 Reorder the terms: 0.875 + x = 1.940521837 Solving 0.875 + x = 1.940521837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = 1.940521837 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 1.940521837 + -0.875 x = 1.940521837 + -0.875 Combine like terms: 1.940521837 + -0.875 = 1.065521837 x = 1.065521837 Simplifying x = 1.065521837

Subproblem 2

x + 0.875 = -1.940521837 Simplifying x + 0.875 = -1.940521837 Reorder the terms: 0.875 + x = -1.940521837 Solving 0.875 + x = -1.940521837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = -1.940521837 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -1.940521837 + -0.875 x = -1.940521837 + -0.875 Combine like terms: -1.940521837 + -0.875 = -2.815521837 x = -2.815521837 Simplifying x = -2.815521837

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.065521837, -2.815521837}

See similar equations:

| 7+na=15 | | 2=t+5 | | 10x^2+88x=18 | | -8-2= | | 2-y=5 | | 2x^2+4x=6 | | 1-y=5 | | 2(-8)= | | y+4.2=6 | | 2(3f-3)=18 | | x^2=2x+35 | | z+37=74 | | x^3+4x^2-12x-48=0 | | x=5y+5 | | t-2t+6=-16 | | 5+2(y+5)=20 | | x^3-4x^2-4x+16= | | 1*3(x+4)=14 | | y=4+2x | | 8(0)+2y=24 | | -6=8+7x | | 19-c=11 | | -2a+3+3a=5-25 | | 8x-2(0)=24 | | 8-k=40 | | -(5x-4)-(6x-6)+9=-8(x-1)-(6x+7)+3 | | 4z^4-10z^3-50z^2= | | 28-2(5+6)=x | | (7x-28)=(10x-13) | | 21x(x+3)+7x^2(x+3)=7x(x+3)(x+3) | | 36y^2+60y+25= | | 24x^4+28x^3-12x^2=0 |

Equations solver categories