Question

find the value of mn when m+n = 12 and m-n = 8​

Answer 1

Answer:

m+n= 12

m-n=8

m= 8+n

m+n=12

8+n+n=12

2n=4

n=2

m=8+2

m=10

Answer 2

Answer:

==》mn=20

Step-by-step explanation:

• m+n = 12 and m-n = 8

• Adding both the equations, we get..2m=20, m=10

• Substituting m=10 in equation m+n = 12,

• 10+n=12, n=12-10, n=2.

• mn=10×2=20

• Therefore 20 is the correct answer.