Question

find two positive real numbers whose product is a aximum and whose sum is 138

Answer 1

a+b=138
ab ----> maximize

Answer 2

no i am in precalc

Answer 3

our options are
a) 67,71
b) 69,69
c)74,64
d)78,60
e)57,81

Answer 4

The highest point is the vertex, so that what we should find

Answer 5

(138-b)b=138b-b^2
-b/2a

Answer 6

You could also use the fact that given a perimeter, the largest area is a square.
So to maximize a*b, then a should equal b.
a=b=69