(x+6)(x+4)=x^2-81

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Solution for (x+6)(x+4)=x^2-81 equation:


Simplifying
(x + 6)(x + 4) = x2 + -81

Reorder the terms:
(6 + x)(x + 4) = x2 + -81

Reorder the terms:
(6 + x)(4 + x) = x2 + -81

Multiply (6 + x) * (4 + x)
(6(4 + x) + x(4 + x)) = x2 + -81
((4 * 6 + x * 6) + x(4 + x)) = x2 + -81
((24 + 6x) + x(4 + x)) = x2 + -81
(24 + 6x + (4 * x + x * x)) = x2 + -81
(24 + 6x + (4x + x2)) = x2 + -81

Combine like terms: 6x + 4x = 10x
(24 + 10x + x2) = x2 + -81

Reorder the terms:
24 + 10x + x2 = -81 + x2

Add '-1x2' to each side of the equation.
24 + 10x + x2 + -1x2 = -81 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
24 + 10x + 0 = -81 + x2 + -1x2
24 + 10x = -81 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
24 + 10x = -81 + 0
24 + 10x = -81

Solving
24 + 10x = -81

Solving for variable 'x'.

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

Add '-24' to each side of the equation.
24 + -24 + 10x = -81 + -24

Combine like terms: 24 + -24 = 0
0 + 10x = -81 + -24
10x = -81 + -24

Combine like terms: -81 + -24 = -105
10x = -105

Divide each side by '10'.
x = -10.5

Simplifying
x = -10.5

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