Question

3. Multiply (i) a2 - 2ab
by 4​

Answer 1

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CBSE

Mathematics

Grade 8

Factorisation of Polynomials

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How do you factor a2−2ab+b2 ?

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Hint: Here we will use the concept of splitting the middle terms and first making the pair of two terms and then finding the common factors from the paired terms and finally the factors for the given expression.

Complete step-by-step answer:

Take the given expression

a2−2ab+b2

Now we will use the concept of to split the middle term.

Here we have three terms in the given expression.

Now, multiply the constant in the first term with the last term.

i.e. 1×(1)=(1)

Now, you have to split the middle term to get (1) in multiplication and addition or subtraction to get the middle term i.e. (−2) . Here applying the basic concept of the product of two negative terms gives us the positive term and addition of two negative terms gives the value in the negative sign.

(1)=(−1)×(−1)(−2)=(−1)−1

Write the equivalent value for the middle term –

a2−ab−ab+b2

Now, make the pair of two terms in the above equation-

=a2−ab−−−−−−−ab+b2−−−−−−−

Find the common factors from the paired terms –

=a(a−b)−b(a−b)

Take the common factors in the above equation –

=(a−b)(a−b)

By using the law of power and exponent, when bases are the same then powers are added.

=(a−b)1+1

Simplify the above expression

=(a−b)2

Hence, factor of a2−2ab+b2 is =(a−b)2

So, the correct answer is “ (a−b)2 ”.

Answer 2

Answer:

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