Question

If a+b=4 and a-b=2, then what is the value of 4ab

Answer 1

a+b=4

a-b=2

by elimination method

2a=6

a=3

substituting a=3 in (1)

a+b=4

b=4-a

b=1

now 4ab

4*3*1

=12

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Answer 2

Answer:

12

Step-by-step explanation:

subtracting both;

a+b=4

a-b=2

2a=6

a=3 -- 1

a+b=4

3+b=4 (from1)

b=1 -- 2

 

putting 1 & 2 in 4ab

4(3)(1)=12