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Sagot :

Bonjour,

* signifie multiplié par

Rappel:

(a+b)²=a²+2ab+b²

(a-b)²=a²-2ab+b²

(a+b)(a-b)=a²-b²

a(b-c)=ab-ac

A=(2y+3)²-(3y-2)²

=(2y)²+2*2y*3+3²-[(3y)²-2*3y*2+2²]

=4y²+12y+9-(9y²-12y+4)

=4y²+12y+9-9y²+12y-4

= -5y²+24y+5

B=(4y+3)(4y-3)+4(2y-1)

=(4y)²-3²+4*2y-4*1

=16y²-9+8y-4

=16y²+8y-13

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