We can write $(a - b)^{2} = a^{2} - b^{2} - 2 a b$ .

True

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False

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Solution

The correct option is B False

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How can we factorise a²+ 2ab + b²-9

Which of the following is correct?
a) $(a - b)^{2} = a^{2} + 2 a b - b^{2}$
b) $(a - b)^{2} = a^{2} - 2 a b + b^{2}$
c) $(a - b)^{2} = a^{2} - b^{2}$
d) $(a + b)^{2} = a^{2} + 2 a b - b^{2}$

Q. Question 3

Which of the following is correct?
a)

(a - b)^{2} = a^{2} + 2 a b - b^{2}

(a - b)^{2} = a^{2} - 2 a b + b^{2}

(a - b)^{2} = a^{2} - b^{2}

(a + b)^{2} = a^{2} + 2 a b - b^{2}

Q. Evaluate:

\sqrt{\frac{a^{2} + 2 a b + b^{2}}{a^{2} - 2 a b + b^{2}}}

Solve:

(a^{2} + b^{2} +2ab) - (a^{2} + b^{2} - 2ab)

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We can write (a−b)2=a2−b2−2ab.

The correct option is B False

We can write $(a - b)^{2} = a^{2} - b^{2} - 2 a b$ .