(a)(a+1)=(a+5)(a-2)

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Solution for (a)(a+1)=(a+5)(a-2) equation:


Simplifying
(a)(a + 1) = (a + 5)(a + -2)

Reorder the terms:
a(1 + a) = (a + 5)(a + -2)
(1 * a + a * a) = (a + 5)(a + -2)
(1a + a2) = (a + 5)(a + -2)

Reorder the terms:
1a + a2 = (5 + a)(a + -2)

Reorder the terms:
1a + a2 = (5 + a)(-2 + a)

Multiply (5 + a) * (-2 + a)
1a + a2 = (5(-2 + a) + a(-2 + a))
1a + a2 = ((-2 * 5 + a * 5) + a(-2 + a))
1a + a2 = ((-10 + 5a) + a(-2 + a))
1a + a2 = (-10 + 5a + (-2 * a + a * a))
1a + a2 = (-10 + 5a + (-2a + a2))

Combine like terms: 5a + -2a = 3a
1a + a2 = (-10 + 3a + a2)

Add '-1a2' to each side of the equation.
1a + a2 + -1a2 = -10 + 3a + a2 + -1a2

Combine like terms: a2 + -1a2 = 0
1a + 0 = -10 + 3a + a2 + -1a2
1a = -10 + 3a + a2 + -1a2

Combine like terms: a2 + -1a2 = 0
1a = -10 + 3a + 0
1a = -10 + 3a

Solving
1a = -10 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
1a + -3a = -10 + 3a + -3a

Combine like terms: 1a + -3a = -2a
-2a = -10 + 3a + -3a

Combine like terms: 3a + -3a = 0
-2a = -10 + 0
-2a = -10

Divide each side by '-2'.
a = 5

Simplifying
a = 5

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