1) (2/7-2х)^2=4/49+4х^2-8/7х
2) (1/3-3а)^2=1/9+9а^2-2а
3) (3х^3-8а^4)^2=(3х^3)^2-2×3х^3×8а^4+(8а^4)^2=9х^6-48а^4×х^3+64а^8
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Answers & Comments
1) (2/7-2х)^2=4/49+4х^2-8/7х
2) (1/3-3а)^2=1/9+9а^2-2а
3) (3х^3-8а^4)^2=(3х^3)^2-2×3х^3×8а^4+(8а^4)^2=9х^6-48а^4×х^3+64а^8