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OxbridgeMind TMUA Paper 1 · Q13

Paper 1Functions & graphs

For k>0k>0, the function

f(x)=(k+52)x2+3k2x+6kf(x)=\left(k+\frac52\right)x^2+3k^2x+6k

has its minimum at x=−1x=-1. Find kk.

A23\frac23
B−1-1
C53\frac53
D33
E11

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