The function f is given in three equivalent forms. Which form most quickly reveals the vertex?
A. f(x)=-3(x+1)(x-5)
B. f(x)=-3x^2+12x+15
C. f(x)=-3(x-2)^2+27

what is the vertex?
( , )

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First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.