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2014-02-24T17:53:55+01:00

Exercice 10:

a) 2 (x+3)

= 2x + 6

b) -3 (y + 5)

= -3y + (-15)

= -3y - 15

c) -2 (x - 6)

= -2x - (-12)

= -2x + 12

d) -3y (-9 - y)

= 27y - (-3y)

= 27 + 3y^2