Question

Find the value of-
4ab, if a+b=9 and a-b=5​

Answer 1

Answer: 56

Step-by-step explanation:

you find the meadian of the 2 answers, which in the case of 9 and 5 is 7. so one is seven, if you plus 2 you get 9, if you minus 2 you get 5. So one of a and b is 7 and the other is 2, if you do ab, you get 14, 14 x 4 = 56. So 56 is the answer.

Answer 2

Answer:

a=7, b=2

hence,

4ab=56

Step-by-step explanation:

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a+b=7...............(1)

a-b=5...............(2)

Subtract equation (2) from equation (1)

We get,

2b=4

therefore, b=2

Substitute value of b in equation (1),

hence,

a+2=9

a=7