Advertisements
Advertisements
प्रश्न
If the roots of the quadratic equation `2x^2+8x+k=0` are equal then find the value of k.
उत्तर
It is given that the roots of the quadratic equation `2x^2+8x+k=0`
are equal.
∴`D=0`
⇒`8^2-4xx2xxk=0`
⇒`64-8k=0`
⇒`k=8`
Hence, the value of k is `8`.
APPEARS IN
संबंधित प्रश्न
If one root of `5x^2+13x+k=0` be the reciprocal of the other root then the value of k is
`(a)0 (b)1 (c)2 (d)5`
Decide whether the following equation is quadratic equation or not.
`"y"^2 + 1/"y" = 2`
Pintu takes 6 days more than those of Nishu to complete certain work. If they work together they finish it in 4 days. How many days would it take to complete the work if they work alone.
Choose the correct answer for the following question.
Which of the following quadratic equations has roots 3,5?
Choose the correct answer for the following question.
One of the roots of equation x2 + mx – 5 = 0 is 2; find m.
Alka spends 90 % of the amount sent to her and saves Rs. 120 per month. Find the amount sent to her per month.
Obtain a quadratic equation whose roots are –3 and –7.
Write the degree of Polynomial 5x2 + 2x + 3x4 + 4.
Two water taps together can fill a tank in `1(7)/(8)` hours. The tap with longer diameter takes 2 hours less than the tap with a smaller one to fill the tank separately. Find the time in which each tap can fill the tank separately.
Present age of mother of Manish is 1 year more than 5 times the present age of Manish. Four years before, if the product of their ages was 22, then find the present age of Manish and his mother
