x^2+2(a-2)x+a^2-4a-21=0

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Solution for x^2+2(a-2)x+a^2-4a-21=0 equation: 


Simplifying
x2 + 2(a + -2) * x + a2 + -4a + -21 = 0

Reorder the terms:
x2 + 2(-2 + a) * x + a2 + -4a + -21 = 0

Reorder the terms for easier multiplication:
x2 + 2x(-2 + a) + a2 + -4a + -21 = 0
x2 + (-2 * 2x + a * 2x) + a2 + -4a + -21 = 0

Reorder the terms:
x2 + (2ax + -4x) + a2 + -4a + -21 = 0
x2 + (2ax + -4x) + a2 + -4a + -21 = 0

Reorder the terms:
-21 + -4a + 2ax + a2 + -4x + x2 = 0

Solving
-21 + -4a + 2ax + a2 + -4x + x2 = 0

Solving for variable 'a'.

The solution to this equation could not be determined.

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