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Sia ? 6 years, 8 months ago

This shows that 152 < 252
Next perfect square is 162 = 256
Hence, the number to be added is 162 – 252 = 256 – 252 = 4
Therefore, the perfect square so obtained is 252 + 4 = 256
Hence, {tex}\sqrt {256} {/tex} = 16.
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Yogita Ingle 7 years, 1 month ago
x2 - x - 6
= x2 - 3x - 2x - 6
= x (x - 3) - 2 ( x - 3)
= ( x - 2) ( x - 3)
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Given, 2x2 - 7x - 15
= 2x2 - 10x + 3x - 15
{tex}= 2x (x - 5) + 3(x - 5)\\= (x - 5)(2x + 3){/tex}
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