Question

2. Discuss the nature of roots of the equation x2 – 3x - 9 = 0
OR
Find the value of k such that x= 1 is one of the roots of the quadratic equation 3x2 – kx + 7 = 0
A man walks 20 m due east and 15 m due South. How far is he from the starting nint n​

Answer 1

Answer:

1) a=1,b=-3 ,c=-9

Step-by-step explanation:

x=-b+_√b^2-4ac/2a

=3+_√9-(-9)/2

=3+_√18/2

=3+_3√2/2

x=3+3√2/2 ,3-3√2/2

2)x=1

3x^2-kx+7=0

3×1^2-k×1+7=0

-k=-7-3

-k=-10

k=10

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Answer 2

Answer:

He is far by 10m from starting point.