Which of the following expressions are perfect squares? \[9{{x}^{2}}-6x+9\] \[{{x}^{2}}-7x+10\] \[49{{x}^{2}}+9{{y}^{2}}-42xy\] \[16{{x}^{2}}+24x+9\]

Which of the following expressions are perfect squares? \[9{{x}^{2}}-6

1.	Which of the following expressions are perfect squares? \[9{{x}^{2}}-6x+9\] \[{{x}^{2}}-7x+10\] \[49{{x}^{2}}+9{{y}^{2}}-42xy\] \[16{{x}^{2}}+24x+9\]
A.	Only (i) and (ii)
B.	Only (ii) and (iii)
C.	Only (i) and (iv)
D.	Only (iii) and (iv)
Answer» E.

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Which of the following expressions are perfect squares? \[9{{x}^{2}}-6x+9\] \[{{x}^{2}}-7x+10\] \[49{{x}^{2}}+9{{y}^{2}}-42xy\] \[16{{x}^{2}}+24x+9\]

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