(x-2.9)(x+1.4)=0

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Solution for (x-2.9)(x+1.4)=0 equation:


Simplifying
(x + -2.9)(x + 1.4) = 0

Reorder the terms:
(-2.9 + x)(x + 1.4) = 0

Reorder the terms:
(-2.9 + x)(1.4 + x) = 0

Multiply (-2.9 + x) * (1.4 + x)
(-2.9(1.4 + x) + x(1.4 + x)) = 0
((1.4 * -2.9 + x * -2.9) + x(1.4 + x)) = 0
((-4.06 + -2.9x) + x(1.4 + x)) = 0
(-4.06 + -2.9x + (1.4 * x + x * x)) = 0
(-4.06 + -2.9x + (1.4x + x2)) = 0

Combine like terms: -2.9x + 1.4x = -1.5x
(-4.06 + -1.5x + x2) = 0

Solving
-4.06 + -1.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '4.06' to each side of the equation.
-4.06 + -1.5x + 4.06 + x2 = 0 + 4.06

Reorder the terms:
-4.06 + 4.06 + -1.5x + x2 = 0 + 4.06

Combine like terms: -4.06 + 4.06 = 0.00
0.00 + -1.5x + x2 = 0 + 4.06
-1.5x + x2 = 0 + 4.06

Combine like terms: 0 + 4.06 = 4.06
-1.5x + x2 = 4.06

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 4.06 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 4.06 + 0.5625

Combine like terms: 4.06 + 0.5625 = 4.6225
0.5625 + -1.5x + x2 = 4.6225

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 4.6225

Calculate the square root of the right side: 2.15

Break this problem into two subproblems by setting 
(x + -0.75) equal to 2.15 and -2.15.

Subproblem 1

x + -0.75 = 2.15 Simplifying x + -0.75 = 2.15 Reorder the terms: -0.75 + x = 2.15 Solving -0.75 + x = 2.15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 2.15 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 2.15 + 0.75 x = 2.15 + 0.75 Combine like terms: 2.15 + 0.75 = 2.9 x = 2.9 Simplifying x = 2.9

Subproblem 2

x + -0.75 = -2.15 Simplifying x + -0.75 = -2.15 Reorder the terms: -0.75 + x = -2.15 Solving -0.75 + x = -2.15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -2.15 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -2.15 + 0.75 x = -2.15 + 0.75 Combine like terms: -2.15 + 0.75 = -1.4 x = -1.4 Simplifying x = -1.4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.9, -1.4}

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