jika (y+a)(y+b) = y^2-49 dan a > b nilai a- b

(y + a)(y + b) = y² - 49

a > b
a - b = ...?

rumus dasar
a² - b² = (a + b)(a - b)

(y + a)(y + b) = y² - 49
(y + a)(y + b) = (y + 7)(y - 7)

maka :
a = 7
b = -7

a - b = 7 - (-7) = 7 + 7 = 14