Question

Спростити вираз…………….

Answer 1

я думаю так...........................

Answer 2

$\displaystyle\bf\\(2x-5)(2x+3)-4(x^{2} -x)=\\\\=2x\cdot 2x+2x\cdot 3-5\cdot 2x-5\cdot 3-4\cdot x^{2} -4\cdot(-x)=\\\\=4x^{2} +6x-10x-15-4x^{2} +4x=\\\\=\underbrace{(4x^{2} -4x^{2} )}_{0}+\underbrace{(6x-10x+4x)}_{0}-15=-15$