The function is defined for

MATHEMATICS · Single correct · A Level · Mathematics · Differentiation · Differentiation

Problem

The function

m(x)=x^{5/2}-2x^{3/2}

is defined for

x\ge 0

. For which value(s) of

x

does the graph of

m

have a horizontal tangent line? (a)

\{6/5\}

(b)

\{0,\;6/5\}

(c)

\{0,\;3/5\}

(d)

\{0,\;2\}