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Jelly19
@Jelly19
May 2019
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Factoriser : (x+3)²-(2x-6)²
DM Math 2nd
Merci.
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Bonjour
(x+3)²-(2x-6)² = [(x+3)-(2x-6] [(x+3)+(2x-6)]
= [x+3-2x+6] [x+3+2x-6]
= (x-2x+3+6) (x+2x+3-6)
= (-x+9) (3x-3)
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(x+3)²-(2x-6)² = [(x+3)-(2x-6] [(x+3)+(2x-6)]
= [x+3-2x+6] [x+3+2x-6]
= (x-2x+3+6) (x+2x+3-6)
= (-x+9) (3x-3)