4x^2-4.2x-1.3=0

Simple and best practice solution for 4x^2-4.2x-1.3=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^2-4.2x-1.3=0 equation:


Simplifying
4x2 + -4.2x + -1.3 = 0

Reorder the terms:
-1.3 + -4.2x + 4x2 = 0

Solving
-1.3 + -4.2x + 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'.
-0.325 + -1.05x + x2 = 0

Move the constant term to the right:

Add '0.325' to each side of the equation.
-0.325 + -1.05x + 0.325 + x2 = 0 + 0.325

Reorder the terms:
-0.325 + 0.325 + -1.05x + x2 = 0 + 0.325

Combine like terms: -0.325 + 0.325 = 0.000
0.000 + -1.05x + x2 = 0 + 0.325
-1.05x + x2 = 0 + 0.325

Combine like terms: 0 + 0.325 = 0.325
-1.05x + x2 = 0.325

The x term is -1.05x.  Take half its coefficient (-0.525).
Square it (0.275625) and add it to both sides.

Add '0.275625' to each side of the equation.
-1.05x + 0.275625 + x2 = 0.325 + 0.275625

Reorder the terms:
0.275625 + -1.05x + x2 = 0.325 + 0.275625

Combine like terms: 0.325 + 0.275625 = 0.600625
0.275625 + -1.05x + x2 = 0.600625

Factor a perfect square on the left side:
(x + -0.525)(x + -0.525) = 0.600625

Calculate the square root of the right side: 0.775

Break this problem into two subproblems by setting 
(x + -0.525) equal to 0.775 and -0.775.

Subproblem 1

x + -0.525 = 0.775 Simplifying x + -0.525 = 0.775 Reorder the terms: -0.525 + x = 0.775 Solving -0.525 + x = 0.775 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.525' to each side of the equation. -0.525 + 0.525 + x = 0.775 + 0.525 Combine like terms: -0.525 + 0.525 = 0.000 0.000 + x = 0.775 + 0.525 x = 0.775 + 0.525 Combine like terms: 0.775 + 0.525 = 1.3 x = 1.3 Simplifying x = 1.3

Subproblem 2

x + -0.525 = -0.775 Simplifying x + -0.525 = -0.775 Reorder the terms: -0.525 + x = -0.775 Solving -0.525 + x = -0.775 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.525' to each side of the equation. -0.525 + 0.525 + x = -0.775 + 0.525 Combine like terms: -0.525 + 0.525 = 0.000 0.000 + x = -0.775 + 0.525 x = -0.775 + 0.525 Combine like terms: -0.775 + 0.525 = -0.25 x = -0.25 Simplifying x = -0.25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.3, -0.25}

See similar equations:

| 15+n=30 | | (x^3+x^2+2x-4)=0 | | 5x-2x+5=x+1 | | 5/2450=t/1470 | | 48(m+25)= | | x+6+2x+x=25 | | 12x+10=7x+9+4x+13 | | 3x^6-22x^3-16=0 | | 7x+12=3x+14+3x+16 | | M*4=6 | | y=10ln(x)(x)-5x | | f(24)=-11x+2 | | -4=y-4y | | 22x=44findx | | s(t)=-16t^2+200t | | Y=2tgx^2 | | (6x+56)=(2x+28) | | 3x^2-10x+240=0 | | 6f+5=7 | | 100-p=10+0.5p | | 5x+11=-32 | | r(t)=24t+256 | | (2n+5)=3 | | y=10ln(x)(x) | | (2n-5)=3n | | (3m-2g)(7-g)=0 | | 4x^2+2x+3-5x^2-3x-4= | | B*8=7 | | iz^2-(1+i)z+1=0 | | 29=p^20 | | .12x-.02=.04 | | .3x-.3=.7 |

Equations solver categories