Book
Maths Puzzle
Numerical Ability
x+y=7 xy=10 find x^3+y^3
Read Solution (Total 1)
(x-y)^2=(x+y)^2-4xy=49-40=9
(x-y)=3
x=5,y=2
x^3+y^3=125+8=133
10 years ago
Helpfull: Yes(0) No(0)
Book Other Question
the mean of 20 observation found is 65 but later it was found that 69 was misread as 96 find the correct mean
find the value of x when x is the mean proportion between x-2 and x+6