При x = 12,5:
4(12,5)² - 20(12,5) + 25 = 4(156,25) - 250 + 25 = 625 - 250 + 25 = 400
При x = 0:
4(0)² - 20(0) + 25 = 0 - 0 + 25 = 25
При x = -2:
4(-2)² - 20(-2) + 25 = 4(4) + 40 + 25 = 16 + 40 + 25 = 81