Question

10a²-a³ при a=11, при a=9

Answer 1

$10a^2-a^3=a^2(10-a) \\ a^2(10-a) = 9^2(10-9) = 81 \cdot 1 = 81$

Answer 2

$10a^{2}$–$a^{3}$ = $a^{2}$(10–a)
a) 121(10–11) = 121×(–1) = –121
b) 81(10–9) = 81×1 = 81