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Find discriminant of the quadratic equat...

Find discriminant of the quadratic equation `2x^2+4x-7=0`

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The correct Answer is:
`=72`
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EDUCART PUBLICATION-SAMPLE PAPER 8-PART - A (SECTION - I)
  1. Insert a rational and an irrational number between 2 and 3.

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  2. Find the zeroes of the polynomial p(x) = 4x^(2) - 12 x +9.

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  3. If x = a and y = b is the solution of the equations x - y =2 and x +...

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  4. Find discriminant of the quadratic equation 2x^2+4x-7=0

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  5. Find the roots of quadratic equation x^2 - 4x + 2.

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  6. If Sn = 5n^2 + 3n, then find its n^(th) term.

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  7. If the common difference of an AP is 5, then what is a(18)-a(13) ?

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  8. In an A.P., a=-6 and d = 2. Find the sum of its first 20 terms.

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  9. Write the relationship between the coefficients, if the following pair...

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  10. In a triangleABC, right-angled at B, if AB : AC = 1:2, then find the v...

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  11. If tantheta+cottheta=2 then find the value of tan^(2)theta+cot^(2)thet...

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  12. If tan A = 1 (0^@ lt A lt 90^@) and cos B =(1)/(sqrt2)(0^@ lt B lt 90^...

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  13. Evaluate: &nbspsin^2 60^@+2tan 45^@-cos^2 30^@

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  14. Find the area of a circle whose circumference is 22 cm.

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  15. The ratio between the volumes of two spheres is 8 : 27. What is the ra...

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  16. Find the class-marks of the class interval 10-25.

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  17. One card is drawn at from a pack of 52 cards. Find the probability tha...

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  18. How many face cards are there in a pack of 52 cards?

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  19. Determine the upper limit of the modal class of the following frequenc...

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  20. Empiricla relationship between the three measures of central tendency ...

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