Ann's answer to unknown's Secondary 4 A Maths question.
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12x-6-3x^2=-3(x^2-4x+2)=-3[(x-2)^2-2]
when x=2, f(x) is biggest, f(2)=6
f(-1)=-21, f(5)=-21
[-21，6]
when x=2, f(x) is biggest, f(2)=6
f(-1)=-21, f(5)=-21
[-21，6]
Date Posted:
6 years ago
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