Answer:
A : −10a4+17a2s−6s2
Step-by-step explanation:=
=(−2a2+s)(5a2+−6s)
=(−2a2)(5a2)+(−2a2)(−6s)+(s)(5a2)+(s)(−6s)
=−10a4+12a2s+5a2s−6s2
=−10a4+17a2s−6s2
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