Question

Спростити: (2к – 3)²– (к + 2)² ​

Answer 1

$\displaystyle (2k-3)^2-(k+2)^2=4k^2-12k+9-(k^2+4k+4)=4k^2-12k+9-k^2-4k-4=3k^2-16k+5$