1.
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2.
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If x–y =4 and xy=21 then x3– y3 =__
3.
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4.
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5.
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6.
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If a +b + c = 10 and a2 +b2 + c2 =36 then ab + bc + ca=___
7.
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8.
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If x2 – 3x + 1 = 0, then the value of x + 1/x is
10.
If p + q = 10 and pq = 5, then the numerical value of p/q +q/p will be
11.
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x2 - y2 = 80 and x – y = 8,then the average of x and y is
12.
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13.
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14.
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If (64)2 - (36)2 = 20 x , then x = ?
15.
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If a + b = 10 and ab = 21, then the value of (a – b)2 is
