a^2+9a-36=(a-12)(a+4)

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Solution for a^2+9a-36=(a-12)(a+4) equation:


Simplifying
a2 + 9a + -36 = (a + -12)(a + 4)

Reorder the terms:
-36 + 9a + a2 = (a + -12)(a + 4)

Reorder the terms:
-36 + 9a + a2 = (-12 + a)(a + 4)

Reorder the terms:
-36 + 9a + a2 = (-12 + a)(4 + a)

Multiply (-12 + a) * (4 + a)
-36 + 9a + a2 = (-12(4 + a) + a(4 + a))
-36 + 9a + a2 = ((4 * -12 + a * -12) + a(4 + a))
-36 + 9a + a2 = ((-48 + -12a) + a(4 + a))
-36 + 9a + a2 = (-48 + -12a + (4 * a + a * a))
-36 + 9a + a2 = (-48 + -12a + (4a + a2))

Combine like terms: -12a + 4a = -8a
-36 + 9a + a2 = (-48 + -8a + a2)

Add '-1a2' to each side of the equation.
-36 + 9a + a2 + -1a2 = -48 + -8a + a2 + -1a2

Combine like terms: a2 + -1a2 = 0
-36 + 9a + 0 = -48 + -8a + a2 + -1a2
-36 + 9a = -48 + -8a + a2 + -1a2

Combine like terms: a2 + -1a2 = 0
-36 + 9a = -48 + -8a + 0
-36 + 9a = -48 + -8a

Solving
-36 + 9a = -48 + -8a

Solving for variable 'a'.

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

Add '8a' to each side of the equation.
-36 + 9a + 8a = -48 + -8a + 8a

Combine like terms: 9a + 8a = 17a
-36 + 17a = -48 + -8a + 8a

Combine like terms: -8a + 8a = 0
-36 + 17a = -48 + 0
-36 + 17a = -48

Add '36' to each side of the equation.
-36 + 36 + 17a = -48 + 36

Combine like terms: -36 + 36 = 0
0 + 17a = -48 + 36
17a = -48 + 36

Combine like terms: -48 + 36 = -12
17a = -12

Divide each side by '17'.
a = -0.7058823529

Simplifying
a = -0.7058823529

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