A= 15+z+ square root 17(z+15)/ z-2 z=2a^2/(a-1)^2 + 30a/(a-1)^2 - 15/(a-1)^2...

Mathematics, 19.06.2020 02:57, rosezgomez97

$\frac{a(3 + a)}{3} \leqslant \frac{z(a - 1) {}^{2} }{15} - \frac{(a - 1)(4 - a)}{5} + \frac{1}{5}$ can anyone help me?

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