2a^2 + 18d^2 = 16a^2 \Rightarrow 18d^2 = 14a^2 \Rightarrow \fracd^2a^2 = \frac1418 = \frac79. - AMAZONAWS

📅 March 11, 2026 👤 scraface

Mar 11, 2026

$2a^2 + 18d^2 = 16a^2 \Rightarrow 18d^2 = 14a^2 \Rightarrow \frac{d^2}{a^2} = \frac{14}{18} = \frac{7}{9}.$