Question

If m
$m \div r(m + r) = v find \: when \: v = 1 \div 5 \: and \: m = 16.$
Answer this question.

Answer 1

v=1/5 and m=16
so
$\frac{m}{rm + {r}^{2} } = v \\ or \: \frac{16}{16r + {r}^{2} } = \frac{1}{5 } \\ or \: 16r + {r}^{2} = 80 \\ or \: {r}^{2} + 16r - 80 = 0 \\ or \: {r }^{2} + 20r - 4r - 80 = 0 \\ or \: r(r + 20) - 4(r + 20) = 0 \\ or \: (r + 20)(r - 4) = 0$
so r= -20 or r= 4 (Answer)
if it helps, plz mark it brainliest.