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e) (3x²-2y)² = (3x²-2y)*(3x²+2y) = 6x²y+9x4-6x²y-4y² = 9x4-4y²
f)(7-5ab)² = (7-5ab)*(7+5ab) = 49+35ab-35ab-25ab²
g) (6pu-tw)²= (6pu-tw)*(6pu+tw) = 36pu²+6putw-6putw-tw² = 36pu²-tw²