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# Consider, the special case of Identity (IV) with a = – c and b = – c. What do you get? Is it related to Identity (II)?What do you get? Is it related to Identity (II)?

Q : 3          Consider, the special case of Identity (IV) with $a=-c$ and $b=-c$ What do
you get? Is it related to Identity (II)?

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Identity IV is $\Rightarrow (a+x )(b +x) = x^{2} + (a+b)x + ab$
If a = b = -c  than,
(x - c)(x - c) = $x^{2} + (-c + (-c))x + (-c) \times (-c)$
$(x-c)^{2} = x^{2} + -2cx + c^{2}$
Which is identity II

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