Question

Using (a-b)using a minus b square is equal to a square minus 2 a b + b square find the value of 689 square ​

Answer 1

Answer:

689² = 474421

Step-by-step explanation:

$(a-b)^{2} = a^{2} - 2ab + b^{2}$

689² = (700 - 11)²

        = 700² - 2(700)(11) + 11²

        = 490000 - 15400 + 121

        = 490121 - 15400

689² = 474421