(3x^2+5x+7)+(2x^2-7x-8)=0

Simple and best practice solution for (3x^2+5x+7)+(2x^2-7x-8)=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 (3x^2+5x+7)+(2x^2-7x-8)=0 equation:


Simplifying
(3x2 + 5x + 7) + (2x2 + -7x + -8) = 0

Reorder the terms:
(7 + 5x + 3x2) + (2x2 + -7x + -8) = 0

Remove parenthesis around (7 + 5x + 3x2)
7 + 5x + 3x2 + (2x2 + -7x + -8) = 0

Reorder the terms:
7 + 5x + 3x2 + (-8 + -7x + 2x2) = 0

Remove parenthesis around (-8 + -7x + 2x2)
7 + 5x + 3x2 + -8 + -7x + 2x2 = 0

Reorder the terms:
7 + -8 + 5x + -7x + 3x2 + 2x2 = 0

Combine like terms: 7 + -8 = -1
-1 + 5x + -7x + 3x2 + 2x2 = 0

Combine like terms: 5x + -7x = -2x
-1 + -2x + 3x2 + 2x2 = 0

Combine like terms: 3x2 + 2x2 = 5x2
-1 + -2x + 5x2 = 0

Solving
-1 + -2x + 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'.
-0.2 + -0.4x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -0.4x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -0.4x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -0.4x + x2 = 0 + 0.2
-0.4x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-0.4x + x2 = 0.2

The x term is -0.4x.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4x + 0.04 + x2 = 0.2 + 0.04

Reorder the terms:
0.04 + -0.4x + x2 = 0.2 + 0.04

Combine like terms: 0.2 + 0.04 = 0.24
0.04 + -0.4x + x2 = 0.24

Factor a perfect square on the left side:
(x + -0.2)(x + -0.2) = 0.24

Calculate the square root of the right side: 0.489897949

Break this problem into two subproblems by setting 
(x + -0.2) equal to 0.489897949 and -0.489897949.

Subproblem 1

x + -0.2 = 0.489897949 Simplifying x + -0.2 = 0.489897949 Reorder the terms: -0.2 + x = 0.489897949 Solving -0.2 + x = 0.489897949 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = 0.489897949 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = 0.489897949 + 0.2 x = 0.489897949 + 0.2 Combine like terms: 0.489897949 + 0.2 = 0.689897949 x = 0.689897949 Simplifying x = 0.689897949

Subproblem 2

x + -0.2 = -0.489897949 Simplifying x + -0.2 = -0.489897949 Reorder the terms: -0.2 + x = -0.489897949 Solving -0.2 + x = -0.489897949 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = -0.489897949 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = -0.489897949 + 0.2 x = -0.489897949 + 0.2 Combine like terms: -0.489897949 + 0.2 = -0.289897949 x = -0.289897949 Simplifying x = -0.289897949

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.689897949, -0.289897949}

See similar equations:

| 2(3x-5)=3(4x+2)-7 | | 12-5x=4(x+1) | | (3x-5)(3x+5)=0 | | 12x-2=24 | | 2(a+b)-4(2a-3b)= | | (3x-1)(5x+2)=0 | | 4x-6-w-2=10w-3w | | 4x-6-w-2=10w-3 | | 2(3+x)=8(x-2) | | 180-x=8(90-x) | | 5y^2+2=-11y | | -(x-1)+10=-3(x+2) | | 0.4(x+2)-.7(x+2)=-.3x-.6 | | 7h-3h+5+9h-14= | | 6-2x-1=4x+5-6x | | 5y-4(-4)=20 | | 11x-5(6x-5)=40 | | 6-21x-1=4x+5-6x | | 5x+4=-2(x+3) | | 12x+40=2x+8+4(2x+6) | | 4x+7-x=10+3x | | k^2-3k-18=0 | | -3(4p+2)-2(4-14p)=3(1+5p) | | -x+6=7x+4 | | 17x-2y=7 | | k^2-3k+18=0 | | -6y+14+4=32 | | 5-7y=12 | | 5-5x=4(3-x) | | 3h-12=12-3h | | (ab^6)(a^8b^3)= | | (7x-1)+(5x-1)+4x=48 |

Equations solver categories