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Sagot :

WADEA0800
L’objectif est de trouver a et b.
Alors,
f(0)=-2 => a*0^2 + b = -2 => b=-2.
Donc f(x) = a*x^2 - 2.
Or f(2)=4 => a* 2^2 - 2 = -4
4a =-4+2=-2
D’où. a = -2/4= -1/2
Ainsi,
f(x) = -1/2* x^2 - 2.

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