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Efectuati:
a) (x-4)(x+5) -(x+1)(x+2)+ 2x + 23


Răspuns :

(x²+5x - 4x - 20)-(x²+x+2x+2)+2x+23 = x²+x - 20 - x²-3x-2 +2x+23= 1
Efectuati:
a) (x-4)(x+5) - (x+1)(x+2) + 2x + 23=
=(x²+5x - 4x - 20) - (x²+x+2x+2) + 2x + 23
= x² + x - 20 - x² - 3x - 2 + 2x + 23
= 1