5X^2+3X=105

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Solution for 5X^2+3X=105 equation:


Simplifying
5X2 + 3X = 105

Reorder the terms:
3X + 5X2 = 105

Solving
3X + 5X2 = 105

Solving for variable 'X'.

Reorder the terms:
-105 + 3X + 5X2 = 105 + -105

Combine like terms: 105 + -105 = 0
-105 + 3X + 5X2 = 0

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

Divide each side by '5'.
-21 + 0.6X + X2 = 0

Move the constant term to the right:

Add '21' to each side of the equation.
-21 + 0.6X + 21 + X2 = 0 + 21

Reorder the terms:
-21 + 21 + 0.6X + X2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 0.6X + X2 = 0 + 21
0.6X + X2 = 0 + 21

Combine like terms: 0 + 21 = 21
0.6X + X2 = 21

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 = 21 + 0.09

Reorder the terms:
0.09 + 0.6X + X2 = 21 + 0.09

Combine like terms: 21 + 0.09 = 21.09
0.09 + 0.6X + X2 = 21.09

Factor a perfect square on the left side:
(X + 0.3)(X + 0.3) = 21.09

Calculate the square root of the right side: 4.592385001

Break this problem into two subproblems by setting 
(X + 0.3) equal to 4.592385001 and -4.592385001.

Subproblem 1

X + 0.3 = 4.592385001 Simplifying X + 0.3 = 4.592385001 Reorder the terms: 0.3 + X = 4.592385001 Solving 0.3 + X = 4.592385001 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 = 4.592385001 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + X = 4.592385001 + -0.3 X = 4.592385001 + -0.3 Combine like terms: 4.592385001 + -0.3 = 4.292385001 X = 4.292385001 Simplifying X = 4.292385001

Subproblem 2

X + 0.3 = -4.592385001 Simplifying X + 0.3 = -4.592385001 Reorder the terms: 0.3 + X = -4.592385001 Solving 0.3 + X = -4.592385001 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 = -4.592385001 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + X = -4.592385001 + -0.3 X = -4.592385001 + -0.3 Combine like terms: -4.592385001 + -0.3 = -4.892385001 X = -4.892385001 Simplifying X = -4.892385001

Solution

The solution to the problem is based on the solutions from the subproblems. X = {4.292385001, -4.892385001}

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