What is the value of X in log 2 (x)-3=1

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

Pranza plotted point a in the coordinate plane below.

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis