Please solve it fast. Question no 4.. Ans is option D...
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Answer:
D
Step-by-step explanation:
coefficient of x² ≥0
a²-1≥0
a² ≥1
a∈ [-1,1]
to make quadratic always positive
D<,0
(a+3)(a-1)>0
intersection of both soln is final answer
a∈(-∞,-3)∪[1,∞)
sorry, i was busy in a work ,,thats why got late posting answer
Thanks... BTW... Don't mind but the result of a>equal to 0 is - infinite to - 1 Union 1 to infinite... Anyway... Thanks for ur time
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