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f(x)=(x-4)²-36
1) f(x)=x²-8x+16-36
=x²-8x-20
2) f(x)=(x-4)²-6²
=(x-4-6)(x-4+6)
=(x-10)(x+2)
3) f(10)=0
f(0)=-20
f(4)=-36
f(x)=0 donne x=10 x=-2
f(x)=-36 donne x=4
f(x)=-20 donne x=0 x=8
1) f(x)=x²-8x+16-36
=x²-8x-20
2) f(x)=(x-4)²-6²
=(x-4-6)(x-4+6)
=(x-10)(x+2)
3) f(10)=0
f(0)=-20
f(4)=-36
f(x)=0 donne x=10 x=-2
f(x)=-36 donne x=4
f(x)=-20 donne x=0 x=8