Question

if a+b=12 and a-b=6 find the value of ab

Answer 1

Step-by-step explanation:

a+b =12

a-b = 6

a= 6 + b

6+ b+b = 12

2b= 6

b=3

a = 6+3 = 9

ab= 9×3

= 27

Answer 2

Answer: - The value of ab = 27

Detailed solution: -

Given: -

a + b = 12 .........eq (1)

a - b = 6 ...........eq (2)

We need to find the value of ab

So,

By substituting method,

We will subtract eq (2) from eq (1),

i.e.,

$a+b-(a-b) = 12-6\\a+b-a+b = 6\\2b = 6\\b = 6/2\\b = 3$

We get,

b = 3

By putting b = 3 in eq (1),

i.e.,

$a+b=12\\a+3=12\\a=12-3\\a=9$

We get,

a = 9

Now,

Putting The value of a and b

$a*b =9*3\\=27$

Therefore,

ab = 27

To know more about the topic, go to the given links: -

https://brainly.in/question/42536635

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