Réponse:
a. x²+6x+9-x²-2x
6x+9-2x
4x+9
d. (t²)²+2t²×2+2²
= t⁴+2t²×2+2²
=t⁴+4t²+4
c. (3t)²-7²
= 9t²-7²
= 9t²-49
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Réponse:
a. x²+6x+9-x²-2x
6x+9-2x
4x+9
d. (t²)²+2t²×2+2²
= t⁴+2t²×2+2²
=t⁴+4t²+4
c. (3t)²-7²
= 9t²-7²
= 9t²-49