Question

On a coordinate plane, the point (3, 6 ) lies on the graph of the function f(x)=3x^2-bx+12

Answer 1

first find the value of "b" by substituting the co ordinates.
then you get as b=8.
next prove that right hand side is equal to the left hand side.

Answer 2

b=11

Explanation:

replace x with 3 and f(x) with 6 solve for b and you get b=11