Hey there!!
Remember :-
... [tex]m^{x}*m^{y}=m^{x+y}[/tex]
Given :-
... -30x⁵ = ( -10x³ ) ( S )
To make -10 to -30, we will need to multiply -10x³ with '3'.
To get x⁵ from x³, we will need to multiply -10x³ with 'x²'.
Hence, the value of S is 3x²
Hope it helps!!