Question

If a³+b³=35 and a+b=5 find value of ab​

Answer 1

Answer:

Step-by-step explanation:

a³+b³ =( a+b)³ - 3ab(a+b)

a³+b³ = 125 - 3ab(5)

a³+b³ = 125-15ab

As  a³+b³=35 so we write

35 -125 = 15ab

therefore = -15ab = -90

thus, ab = 6

Answer 2

Step-by-step explanation:

a³+b³= 35

or,(a+b)³-3ab(a+b)=35

or,(5)³-3ab(5)=35

or,125-15ab=35

or,-15ab=35-125

or,-15ab=-90

or,ab=-90/-15

=6

So, the answer is 6