a^2+b^2=9
,,a+b=1
,,then find
a^4+b^4=?
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Answer:
(a+b)^2=1^2
Step-by-step explanation:
a^2+b^2+2ab=1
9+2ab=1
ab=-4
(a^2+b^2)^2=81
a^4+b^4+2(ab)^2=81
a^4+b^4+32=81
a^4+b^4=49
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