(1) Determine the nature of the roots for the following quadratic equations
(i) 15x2 + 11x + 2 = 0 Solution
(ii) x2 − x − 1 = 0 Solution
(iii) √2t2 −3t + 3√2 = 0 Solution
(iv) 9y2 − 6√2 y + 2 = 0 Solution
(v) 9a2b2x2 −24abcdx + 16c2d2 = 0 , a ≠ 0 , b ≠ 0
(2) Find the value(s) of ‘k’ for which the roots of the following equations are real and equal.
(i) (5k −6)x2 + 2kx + 1 = 0 Solution
(ii) kx2 +(6k + 2)x + 16 = 0 Solution
(3) If the roots of (a −b)x2 + (b −c)x + (c −a) = 0 are real and equal, then prove that b, a, c are in arithmetic progression Solution
(4) If a, b are real then show that the roots of the equation (a − b)x2 −6(a +b)x −9(a − b) = 0 are real and unequal. Solution
(5) If the roots of the equation (c2 −ab)x2 −2(a2 −bc)x +b2 −ac = 0 are real and equal prove that either a = 0 (or) a3 +b3 +c3= 3abc Solution
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