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Sagot :

INEQUATION

Bonsoir,

Développer:

a.5x(3-6x)-4= 15x-30x²-4

b.(3x-2)(5-4x)-3(7x-2)= 15x-10-12x²+8x-21x+6= -12x²-2x-4

c.5x²-4(3-7x)= 5x²-12+28x

d.5(4x-1)-(2x+3)(-5x-7)= 20x-5-(-10x²-15x-14x-21)= 20x-5+10x²+29x+21

                                   = 10x²+49x+16

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