

If x4 – 8x3 + ax2 – bx + 16 = 0 has positive real roots, find a – b.
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4x3 + ax2 – bx + 3 divided by x – 2 leaves remainder 2, divided by x + 3 leaves remainder 3. Find remainder when it is divided by x + 2.
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How many of the following are factors of 3200 – 5100?
1. 7
2. 16
3. 53
4. 12
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x3 – 18x2 + bx – c = 0 has positive real roots, p, q and z. If geometric mean of the roots is 6, find b.
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What is the value of 27x3 + 18x2y + 12xy2 + y3 when x = 4, y = – 8?
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