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Sagot :

Bonjour,

Développer :

= (-3t+1)²+(5t-3)(-t+4)

= (1-3t)²+(5t-3)(-t+4)

= (1-3t)²-5t²+20t+3t-12

↳ Identité remarquable : (a-b)² = a²-2ab+b².

= 1-6t+9t²-5t²+20t+3t-12

= -11-6t+9t²-5t²+20t+3t

= -11+17t+9t²-5t²

= -11+17t+4t²

↳ Loi commutative.

= 4t²+17t-11

Bonne journée.

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