Question

Which value of a would make the following expression completely factored?
2 - а
оооо
49
81

Answer 1

Answer:

12

Step-by-step explanation:

x^2 - a

If a is a perfect square we could factor

x^2 - b^2 = (x-b)(x+b)

So a cannot be 36,49,81 since they are perfect squares

a must be 12