E = 3(x-5) (-2x+1) - 3x(x-5) "-pour les grands parenthèses "3*x-3*(-5) = 3x-15 » « (-2x+1) - 3x2 -15x3x+30-15-3x2 -15x=33x-15x-15-3x2 = 18x-15-3x2
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=(2x-10)(-x+4)+(3x-2)(x-5)
=-2x²+8x+10x-40+3x²-15x-2x+10
=-2x²+3x²+8x+10x-15x-2x-40+10
=x²+18x-17x-30
=x²+x-30
E = 3(x-5) (-2x+1) - 3x(x-5)
=(3x-15)(-2x+1)-3x(x-5)
=-6x²+3x+30x-15-3x²+15x
=-6x²+33x-15-3x²+15x
=-9x²+48x-15