Question

If x+y= 9,x-y= -5 then 4 xy is

Answer 1

Answer:

we will have to find the value of x, y

by elimination method

x+ y=9

x-y= - 5

both y will get cancel

: value of x will be 2x=4

x= 2

: value of y will be y= 9 -2

y=7

now finding value of 4xy = 4×2×7

= 56

your ans is 56

Answer 2

Answer-Easy and correct method... It takes least time, it's helpful for competitive exans