Advertisements
Advertisements
प्रश्न
If the equation `4x^2-3kx+1=0` has equal roots then value of k=?
(a)`+-2/3` (b)`+-1/3`
(c)` +-3/4` (d) `+-4/3`
उत्तर
(d) `+-4/3`
It is given that the roots of the equation `4x^2-3kx+1=0` are equal.
∴` (b^2-4ac)=0`
⇒` (3k)^2-4xx4xx1=0`
⇒`9k^2=16`
⇒`k^2=16/9`
⇒ `k=+-4/3`
APPEARS IN
संबंधित प्रश्न
Which of the following is a quadratic equation?
(a) `x^3-3sqrtx+2=0` (b) `x+1/x=x^2`
(c)` x^2+1/x^2=5` (d) `2x^2-5x=(x-1)^2`
If one root of the equation` 3x^2-10x+3=0 is 1/3` then the other root is
(a) `-1/3` (b) `1/3` (c)`-3` (d)`3`
Solve `x^2-(sqrt3+1)x+sqrt3=0`
Solve` 2x^2+ax-a^2=0`
Decide whether the following equation is quadratic equation or not.
(m + 2) (m – 5) = 0
Suyash scored 10 marks more in second test than that in the first. 5 times the score of the second test is the same as square of the score in the first test. Find his score in the first test.
Solve any four of the following.
Find the value of y in the equation x + y = 12, when x = 5
Solve the following quadratic equation :
x2 +8x + 15 = 0
Mukund has ₹ 50 more than Sagar. If the product of the amount they have is 15,000, then find the amount each has
In a right-angled triangle, altitude is 2 cm longer than its base. Find the dimensions of the right-angled triangle given that the length of its hypotenuse is 10 cm.
