Page 37 - CHAPTER 4 (Quadratic equations)
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CHAPTER 4
QUADRATIC EQUATIONS
2
(i) If D<0 then ax +bx+c>0, if a>0 and ax +bx+c<0 if a<0.
2
D<0
a >0
f(x)>0∀x∈R
f(x)<0∀x∈R
a<0
2
(ii) If D=0 then ax +bx+c≥ 0, if a>0 and ax +bx+c≤ 0, if a<0.
2
D=0
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