Question

(х-5)²-х(х+20) ,якщо х=-0,3

Answer 1

$x^{2} -10x+25- x^{2} -20x=-30x+25$

-30*0.3+25=9+25=34

Answer 2

(x-5)² - x(x+20) = x² - 10x + 25 - x² - 20x = -30x + 25 = -30 · (-0,3) + 25 = 34