What are the zero(s) of f(x)=3x^2 +5 -9x?

1 Answer
Alan P.
Oct 21, 2015

x=(9+-sqrt(21))/6

Explanation:

If f(x)=3x^2+5-9x = 0

3x^2-9x+5 = 0

Using the quadratic formula:
color(white)("XXX")x = (9+-sqrt(9^2-4(3)(5)))/(2(3))

color(white)("XXX")x=(9+-sqrt(81-60))/6

color(white)("XXX")x=(9+-sqrt(21))/6

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