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17.
a) 2(3x-4)²-3(2x - 5)(2x + 5)- 4(x + 3)²-(2x-3)(3x +
b) 2(3x - 1)² - 3(2x + 3)²-(4x-3)² + 2(x-2)(3x + 1);
d) (2-3x)²-(3-5x)²-(4-x)² + (4x-3)(4x + 3);
c) (2x + 5)²-(3x-7)²-(3-2x)²-(5-3x)(5+ 3x);
3(x+3)²-2(2x-7)² + 4(3x - 1)(2x + 5).