I'm stuck on this question and don't really know what to do...completing the square, quadratic formula..? I just don't know....
If anyone can let me know what to do I will be so grateful.
Prove that, for all values of x,
x² + 6x + 18 > 2 - 1/2x
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Last edited by alevelmathshlp; 18-02-2018 at 18:33.
- 18-02-2018 18:32
- 18-02-2018 18:34
x^2 6.5x 16>0
Find the discriminant b^2-4ac and should be negative so there’s no roots and therefore its proven that x^2 6.5x 16>0Last edited by Mosa99; 18-02-2018 at 18:37. Reason: TDA Post Edit