Bonsoir,
Ex. 54 :
a) A = (2x+5)²-9x² = 4x²+20x+25-9x² = -5x²+20x+25
b) A = (2x+5)²-9x² = (2x+5)²-(3x)² = (2x+5+3x)(2x+5-3x) = (5x+5)(5-x)
c) si x=√5 alors A = (5√5+5)(5-√5)
= 25√5-25+25-5√5
= 20√5
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Bonsoir,
Ex. 54 :
a) A = (2x+5)²-9x² = 4x²+20x+25-9x² = -5x²+20x+25
b) A = (2x+5)²-9x² = (2x+5)²-(3x)² = (2x+5+3x)(2x+5-3x) = (5x+5)(5-x)
c) si x=√5 alors A = (5√5+5)(5-√5)
= 25√5-25+25-5√5
= 20√5