Mathematics
Find whether the trinomial is a perfect square or not :
x2 - 4x + 16
Factorisation
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Answer
x2 - 4x + 16
Using the formula
[∵ (x - y)2 = x2- 2xy + y2 ]
Since, (x2 - 4x + 16) cannot be expressed as a2 - 2ab + b2.
Hence, x2 - 4x + 16 is not a perfect square.
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x3 - 4x is equal to:
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x(x + 2) (x - 2)
(x + 4) (x - 4)
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x4 - y4 + x2 - y2 is equal to:
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none of these