Question

(simplify) 7powerN+2 - 3×7powerN+1 upon 20×7powerN (-) 2×7POWER N

Answer 1

Hello Mate!

$\frac{ {7}^{n + 2} - 3 \times {7}^{n + 1} }{20 \times {7}^{n} - 2 \times {7}^{n} } \\ \frac{ {7}^{n} \times {7}^{2} - 3 \times 7 \times {7}^{n} }{ {7}^{n}(20 - 2) } \\ \frac{ {7}^{n}(49 - 21) }{ {7}^{n} \times 18 } \\ = \frac{28}{18} = \frac{14}{9}$

*Answer is 14/9*

Hope it helpe☺!