Question

If a+b = 6 and a-b = 4. Find the value of ab..

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Answer 1

Answer:

a=5 and b=1 so ab =5×1=5

Step-by-step explanation:

• let a+b=6...eqn 1st
• and a-b=4....eqn 2nd
• in eqn 1st
• a=6-b....eqn 3rd
• putting the value of a in equation 2nd
• 6-b-b=4
• -2b=4-6
• -2b=-2
• b=1
• now putting the value of b in equation 3rd
• a=6-1=5
• now according to question
• ab=5×1=5

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Answer 2

Answer:

a+b =6;a-b=4;

(a+b)(a-b)=4 ab (Identity)

=>6*4=4ab

=>24=4ab

=>ab =6