Bonsoir,
4) (2x-5)²+(5-3x)(2x-5)
= 4x²-20x+25+10x-25-6x²+15x
= -2x²+5x
5) (2x-5)²+(5-3x)(2x-5)
= (2x-5)(2x-5)+(5-3x)(2x-5)
= (2x-5)(2x-5+5-3x)
= (2x-5)(-x)
=-(2x-5)x
6) x=2,5 ⇒ -(2x-5)x = -(2(2.5)-5)(2,5)
= -(5-5)(2,5)
= -(0)(2,5)
= 0
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Bonsoir,
4) (2x-5)²+(5-3x)(2x-5)
= 4x²-20x+25+10x-25-6x²+15x
= -2x²+5x
5) (2x-5)²+(5-3x)(2x-5)
= (2x-5)(2x-5)+(5-3x)(2x-5)
= (2x-5)(2x-5+5-3x)
= (2x-5)(-x)
=-(2x-5)x
6) x=2,5 ⇒ -(2x-5)x = -(2(2.5)-5)(2,5)
= -(5-5)(2,5)
= -(0)(2,5)
= 0