Equation -x**2+bx +84 =0 has one root x1 = 10. Determine the coefficient b and the second root x2.


b =  1.6
x2 =  -8.4


x__2 =

Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:
1st comment
Be the first to comment!

To solve this example are needed these knowledge from mathematics:

Looking for help with calculating roots of a quadratic equation?

Next similar examples:

  1. Roots
    parabola Determine the quadratic equation absolute coefficient q, that the equation has a real double root and the root x calculate: ?
  2. Product
    floring The product of two consecutive odd numbers is 899. What are this numbers?
  3. Variations 4/2
    pantagram_1 Determine the number of items when the count of variations of fourth class without repeating is 552 times larger than the count of variations of second class without repetition.
  4. Quadratic equation
    Parabola_tangent Quadratic equation ? has roots x1 = -47 and x2 = -79. Calculate the coefficients b and c.
  5. Discriminant
    Quadratic_equation_discriminant Determine the discriminant of the equation: ?
  6. Combinations
    trezor_1 How many elements can form six times more combinations fourth class than combination of the second class?
  7. Combinations
    math_2 From how many elements we can create 990 combinations 2nd class without repeating?
  8. Quadratic function 2
    parabola1 Which of the points belong function f:y= 2x2- 3x + 1 : A(-2, 15) B (3,10) C (1,4)
  9. Cylinder diameter
    valec.JPG The surface of the cylinder is 113 cm2. The cylinder height is 6 cm. What is the diameter of this cylinder?
  10. Cinema 4
    cinema_2 In cinema are 1656 seats and in the last row are 105 seats , in each next row 3 seats less. How many are the total rows in cinema?
  11. Sequence
    sunflower Between numbers 2 and 78 insert n members of the arithmetic sequence that its sum is 600.
  12. Seats
    divadlo_2 Seats in the sport hall are organized so that each subsequent row has five more seats. First has 10 seats. How many seats are: a) in the eighth row b) in the eighteenth row
  13. Sequence 3
    75 Write the first 5 members of an arithmetic sequence: a7=-51, a17=-121.
  14. Geometric progression 2
    exp_x There is geometric sequence with a1=-5.8 and quotient q=-2.2. Calculate a19.
  15. Theorem prove
    thales_1 We want to prove the sentense: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started?
  16. Trinity
    trojka How many different triads can be selected from the group 29 students?
  17. Fish tank
    zebra_fish A fish tank at a pet store has 10 zebra fish. In how many different ways can George choose 4 zebra fish to buy?