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The necessary condition for px² + qx + r = 0 to be a quadratic equation is
p is not equal to zero
q is not equal to zero
r is not equal to zero
p, q and r are not real.
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Q: The roots of the quadratic equation x² - 3x + 2= 0 are
1, -2
-1, 2
-1, -2
1, 2
Q: E and F are points on the sides PQ and PR respectively of a ΔPQR. For which of the following cases, EF || QR is
PE = 2 cm, EQ= 3 cm, PF = 4 cm and FR = 9 cm
None of these
PE = 5 cm, EQ= 15 cm, PF = 4 cm and FR = 12 cm
PE = 3 cm, EQ= 2 cm, PF = 6 cm and FR = 8 cm
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