x^2+4=(x+1)(x+3)

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Solution for x^2+4=(x+1)(x+3) equation:


Simplifying
x2 + 4 = (x + 1)(x + 3)

Reorder the terms:
4 + x2 = (x + 1)(x + 3)

Reorder the terms:
4 + x2 = (1 + x)(x + 3)

Reorder the terms:
4 + x2 = (1 + x)(3 + x)

Multiply (1 + x) * (3 + x)
4 + x2 = (1(3 + x) + x(3 + x))
4 + x2 = ((3 * 1 + x * 1) + x(3 + x))
4 + x2 = ((3 + 1x) + x(3 + x))
4 + x2 = (3 + 1x + (3 * x + x * x))
4 + x2 = (3 + 1x + (3x + x2))

Combine like terms: 1x + 3x = 4x
4 + x2 = (3 + 4x + x2)

Add '-1x2' to each side of the equation.
4 + x2 + -1x2 = 3 + 4x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
4 + 0 = 3 + 4x + x2 + -1x2
4 = 3 + 4x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
4 = 3 + 4x + 0
4 = 3 + 4x

Solving
4 = 3 + 4x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-4x' to each side of the equation.
4 + -4x = 3 + 4x + -4x

Combine like terms: 4x + -4x = 0
4 + -4x = 3 + 0
4 + -4x = 3

Add '-4' to each side of the equation.
4 + -4 + -4x = 3 + -4

Combine like terms: 4 + -4 = 0
0 + -4x = 3 + -4
-4x = 3 + -4

Combine like terms: 3 + -4 = -1
-4x = -1

Divide each side by '-4'.
x = 0.25

Simplifying
x = 0.25

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