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= -x²
= -(3²)
= -(9)
= -9
b) Si x = -3
= -x²
= -(-3)²
= -(9)
= -9
c) Si x = 3/5
= -x²
= -(3/5)²
= -(3²/5²)
= -(9/25)
= -9/25
d) Si x = -2/3
= -x²
= -(-2/3)²
= -(2²/3²)
= -(4/9)
= -4/9