SUBJECT: MATHEMATICS
1. The zeroes of the quadratic polynomial x2+ax+a,a≠0,
(A) Cannot both be positive (B) Cannot both be negative (C) Are always unequal (D) Are always equal
2. The area of triangle formed by the lines y=x, x=6 and y=0 is
(A) 36 sq unit (B) 18 sq unit (C) 9 sq unit (D) 72 sq unit
3. If ax2+bx+c=0 has equal roots, then c=
(A)-b/2a (B) b/2a (C) -b 2 /4a (D) b 2 /4a
4. The pair of linear equations x=y and x+y=0 has
(A) No common solution (B) Infinitely many solutions (C) Unique solution (D) None of these
5. Sum of zeroes of quadratic equation 3x2 – 5x + 1 = 0 is
(A) 5/3 (B) -5/3 (C) 1/3 (D) -1/3
6. If 3 is the least prime factor of number a and 7 is the least prime factor of number b then the least prime factor of number a+b is
(A) 2 (B) 5
(C) 3 (D) 10
Answers
Answered by
1
Answer:
Since you didnt reposted question am explaining here
x2+kx+k,k≠0
roots or zeroes=(-k+√(k∧2-4k))/2,(-k-√(k∧2-4k))/2
since k≠0 ,roots can't be zero
the nature of root depends on √(k∧2-4k )
k<0 then √(k∧2-4k)>k so roots will be one positive and one negative
if k>0 then √(k∧2-4k) < k both roots will be negative
so both roots can't be positive
Answered by
2
Answer:
correct answers is-
1) (A) Cannot both be positive
2)(B) 18 sq unit
3)(D) b 2 /4a
4)Unique solution
5)5/3
6)(A) 2
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