Question

If a + b + c = 5 then the maximum value of ab 3 c is ..........

Answer 1

Answer:a=5-b-c

b=b

c=5-a-c

Then abc=(5-a-c)(b)(5-b-c)

=25b²-5b²-5bc-5ab+ab²+2abc-5ac+ac²

=5b²(b-1)-5b(c-a)+ab(b-2c)-ac(5-c)