Question

4) The roots of the equation 9x? - bx + 81 = 0 will be equal, if the value of b is 1) +9 2) + 18 3) + 27 4)+54​

Answer 1

Answer:

d)54 is the correct answer

Step-by-step explanation:

If two roots of a quadratic equation are equal then by the discriminant formula we get,

b^2-4ac=0

=>b^2 - 4×9×81=0

=>b=√(4×9×81)=54