a+b=3 a2+b2=7 a4+b4=?
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Answer:
a+b=3 a2+b2=7 a4+b4=47
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0
Answer:
a^2+b^2=7=(a+b)^2-2ab
7=3^2-2ab
7=9-2ab
7-9= -2ab
-2= -2ab
ab= -2/-2=1
a^4+b^4=(a^2+b^2)^2-2a^2b^2
=7^2-2(ab)^2
=49-2.(1)^2
=49-2.1
= 49-2=47
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