Grade 11Algebra
For all the real numbers x expression a^2x^2+bx+1 will be positive if - b^2>4a^2
- b^2
- 4b^2>a^2
- 4b^2
For all the real numbers x expression a^2x^2+bx+1 will be positive if
- b^2>4a^2
- b^2
- 4b^2>a^2
- 4b^2
1 Answer
Vikas TU
Approved Tutor Answer10 Years agoFor all the real numbers x expression a^2x^2+bx+1
Its Discriminant should be less than zero always.
D
b^2 – 4a^2
Or
b^2
and also
a > 0
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