62) (a^2-b)^2=a^4-2a^2b+b^2
63) (z^2+t^3)=z^4+2z^2t^3+t^6
66) =1/25x^4 - 2x^2y+25y^2
67) =9/100a^4 + 12/5a^2 b+16b^2
25) =x^5 - 1 +x^10 -x^5= x^10 -1
26) =16+4y^3 -4y^3 -y^6=16-y^6
27) =nm^2 -n^2 + m^4 -nm^2 = m^4 - n^2
31) = 25a^4 + 15a^2b-15a^2b-9b^2 = 25a^4 -9b^2
32) = 36m^2n -24n^2 +24m^4 -16m^2n=20m^2n-24n^2+24m^4
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Answers & Comments
62) (a^2-b)^2=a^4-2a^2b+b^2
63) (z^2+t^3)=z^4+2z^2t^3+t^6
66) =1/25x^4 - 2x^2y+25y^2
67) =9/100a^4 + 12/5a^2 b+16b^2
25) =x^5 - 1 +x^10 -x^5= x^10 -1
26) =16+4y^3 -4y^3 -y^6=16-y^6
27) =nm^2 -n^2 + m^4 -nm^2 = m^4 - n^2
31) = 25a^4 + 15a^2b-15a^2b-9b^2 = 25a^4 -9b^2
32) = 36m^2n -24n^2 +24m^4 -16m^2n=20m^2n-24n^2+24m^4