(х-7)²+3= (х-2)×(х+2)

(x-7)²+3= (x-2)×(x+2) x² - 14x + 49 + 3 = x² - 4 x² - 14x + 52 = x² - 4 -14x + 52 = -4 -14x = -56 x = 4