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Mathematics
Dodson
22 December, 12:45
What's the non-permissible value for x^2-x-2
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Lillie Conway
22 December, 15:58
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x = - 1 and x = 2 are non-permissible
Step-by-step explanation:
for rational equations, the denominator can't equal zero, so find the zeroes of the equation, those will be the non-permissible numbers ...
take the denominator and set it equal to zero, then solve ...
x² - x - 2 = 0
(x - 2) (x + 1) = 0
so
x - 2 = 0
x = 2
and
x + 1 = 0
x = - 1
Either of these values make the denominator equal zero, so they are not part of the domain of the function (non-permissible numbers)
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