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Sagot :

B=4(3-2x)-(x-7)(2x+3)

=12-8x-(2x²+3x-14x-21)

=12-8x-2x²-3x+14x+21

=-2x²+3x+33

 

x=-2

B=4(3-2*(-2))-(-2-7)(2*(-2)+3)

=4(3+4)-(-2-7)(-4+3)

=4*7-(-9*(-1))

=28-9

=19

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