Asked by Kelly
Find the x-intercepts of f(x)=4x^2-20.
Give an exact answer using radicals as needed. Rationalize all denominators. Express complex numbers in terms of i.
Give an exact answer using radicals as needed. Rationalize all denominators. Express complex numbers in terms of i.
Answers
Answered by
drwls
The x intercept is where f(x) = 0
That would be where 4x^2 = 20, or in other words, where
x^2 = 5
Take the square root of both sides, remembering to use +/-. There should be no denominator to rationalize, so forget about that
That would be where 4x^2 = 20, or in other words, where
x^2 = 5
Take the square root of both sides, remembering to use +/-. There should be no denominator to rationalize, so forget about that
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