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g(x)*(-5)= 10x^2+5x-5
g(x)=-2x^2-x+1.
f⁰g= -5( ax² +bx+c) +3 = - 5ax² - 5bx + ( 3 -5c)
= 10x² + 5x - 2
identificam coeficientii
x² : -5a=10 ⇒a=-2
x : -5b=5 ⇒ b=-1
liber 3-5c=-2⇒ c=1
g(x)= -2x²-x +1