Question

if a+b=8 and a-b=4 then what is the value of ab

Answer 1

a + b = 8...........(1)
a-b = 4

2a = 12

a =6 
 
now substitite a value in (1)

6+ b = 8
 b=2 

now ab

6(2)= 12 

ab = 12

Answer 2

Answer: The answer of the question is ab=12

Step-by-step explanation:

     In this question we have got information from question as :

     a+b=8 and a-b=4

this two equations we have got from the question:

now,

      a+b=8  ............................... (1)

or,

   a-b=4 ..................................(2)

now adding (1) with (2):

  2a=12

or, a=6 .......... (3)

now the equation (3) in (1):

6+b=8

or, b=2

now a*b=6*2=12

so the solution of the question is ab=12

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