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Sagot :

bonsoir

A = -6x + 15 -2x² +6x +5x-15

A = -2x² + 5x

B = 6a -8a-15+20a-10+2a

= -2a-25+20a+2a

= 20a-25

C = -(3z-6-4z²+8z)

= -(11z-4z²-6)

= 4z²-11z+6

D = -10r +15r² -2r²-5r-4r-10

D = -19r + 13r² -10

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