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Question
In the case find whether the trinomial is a perfect square or not:
x2 - 4x + 16
Sum
Solution
x2 - 4x + 16
= (x)2 - x × 4 + (4)2
= a - ab + b2
...[Taking x = a, and 4 = b]
∴ The given trinomial cannot be expressed as a2 - 2ab + b2. Hence, it is not a perfect square.
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Factorising a Perfect Square Trinomial
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