Question

8 x 1 = 8
85 E
I. Four choices are given for each of incomplete / statement / questions.
Choose the correct answer and write the complete answer along with
its letter of alphabet.
1.
If the pair of Linear equations x + 2y = 3 and 2x + 4y = k are coincide then the
value of 'k'is :
A. 3
B. 6
C.
-3
D. -6
2.
The n" term of an arithmetic progression is a = 4n + 5 then the 3rd term is
A. 5
B. 9
C.
13
D. 17
3. If the roots of the quadratic equation x2 + 6x + k = 0 are equal, then the va
of 'k'is :
A. 9
B. -9
C. 8
D. 5​

Answer 1

Step-by-step explanation:

1)

X + 2y = 3 and

2x + 4y = k are coincide

1/2= 2/4= 3/k

k = 3×2=6

answer) B. 6

2)

an= 4n + 5

a3= 4×3+5

= 12+5 = 17

third term =17

answer) D. 17

3)

the roots of the quadratic equation x2 + 6x + k = 0 are equal

b^2-4ac=0 then quadratic equation has equal roots

6^2-1×k= 0

36-4k= 0

36=4k

k=36/4

k=9

answer) A. 9