Упростите (2к-3)(3+2к)-(3к-5)^2-30к

Question

Упростите (2к-3)(3+2к)-(3к-5)^2-30к

Answer 1

(2k-3)(3+2k)-(3k-5)²-30k=(4k²-9)-(9k²-30k+25)-30k=
=4k²-9-9k²+30k-25-30k=-5k²-34