Question

If u+v=7 and uv=12, find u-v

Answer 1

1

Step-by-step explanation:

u+v=7

4+3=7

uv=12

4×3=12

u-v=?

4-3=1

u=4v=3

Answer 2

Answer: 1 or -1 u can write both the answer

Step-by-step explanation: u+v=7

uv=12

then,u=7-v...(i)

and u=12/v...(ii)

on comparing eq (i) and (ii)

we get,7-v=12/v

7v-v^2=12

7v-v^2-12=0

by solving it , we get two values for "v" by quadiratic equation = 4 and 3 , we can use any value either 4 or 3 i am using both for u...

by,v=4...

u=3 ...

then u-v=3-4=-1

if, v=3

then u=4

then,u-v=1

thank u