Which value of a would make the following expression completely factored? x²-a

A.12
B.36
C.49
D.81

The answer is 12.               

12 is not a perfect square like the others.      

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11

answer: i think one of the answer is $150 and $300?

step-by-step explanation: