Question

11] Value of D when root of ax2 + bx + c = 0 are real and unequal will be
 (a) D ≥ 0
(b) D > 0
 (c) D < 0
(d) D = 0

12.] If px2 + qx + r = 0 has equal roots, value of r will be
 (a) q square/4p
(b) -q square/4p
(c) 4p/q square
(d) none of these

13.]  Positive value of p for which equation x2 + px + 64 = 0 and x2 – 8x + p = 0 will both have real roots will be
  (a) p ≥ 16
(b) p ≤ 16
 (c) p = 16
(d) none of these

14.] If equation 9x2 + 6px + 4 = 0 has equal roots, then both roots are equal to
a) +- 2/3
b)+-3
c)+-3/2
d)0
       
15.] If the equation x2 – kx + 1, have no real roots, then
 (a) –2 < k < 2
(b) –3 < k < 3
 (c) k > 2
(d) k < –2​

Answer 1

1. d
2. a
3. b
4. d
5. c

these will be help you

Answer 2

Answer:

11)(b)

12)(a)

13)(a)

14(a)

15)(a)