If a polynomial is in a form of a² - b², we call this a "special property".
You can only get this answer by multiplying (a - b)(a + b).
(a - b)(a + b)
a² + ab - ab - b²
a² - b²
Then let's find the square root of 121. = 11.
(x - 11)(x + 11)
x² + 11x - 11x - 121
x² - 121
To solve this equation, set (x - 11)(x + 11) equal to zero.
(x - 11) = 0 (x + 11) = 0
+11 +11 -11 -11
----------------- ------------------
x = 11 x = -11
Solutions are 11 and -11.
Hope this helped!
