Question

What is to be subtracted from a2 -b2 to get (a-b)2

Answer 1

Hey there!

Let the number be x which is to be substracted

a2 - b2 - x = a2 - 2ab + b2 (a2 cancels on both the sides)

x = -b2 -b2 -2ab

x = -2b2 - 2ab

x = -2b(b+a)

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Priyoshi❤

Answer 2

2ab is to be subtracted.

Step-by-step explanation:

Since we have given that

$a^2 -b^2$

We need to make $(a-b)^2$

Now, as we know that

$(a-b)^2=a^2+b^2-2ab$

So, we just subtract 2ab from the above expression to get the required identity.

Hence, 2ab is to be subtracted.

# learn more:

Subtract a2 -b2 from b2 -a2​

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