Identify the restrictions on the variable x^2+3x+2/x^2-4x-12

QUESTION POSTED AT 18/04/2020 - 06:39 PM

Answered by admin AT 18/04/2020 - 06:39 PM

X^2 - 4x -12 ≠ 0
Let's say it's equal to 0
Δ = b^2 -4ac
(-4)^2 -4(-12)
16 + 48
64

x1, x2 = -b ± √Δ / 2a
-(-4) ± √64 / 2
4 ± 8 / 2
x1 = 4+8/2, x2 = 4-8/2
x1 = 12/2 = 6, x2 = -4/2 = -2

So x can't be 6 or -2!
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