Bonjour,
Développer :
1~ (x+1)² - 9= x²+2x+1-9= x²+2x-8
factoriser:
(x+1)²-9= (x+1)- 3²= (x+1-3)(x+1+3)= (x-2)(x+4)
2~ 100 - (8+x)²
100- (64+16x+x²)= 100-64-16x-x²= -x²-16x+36
Factoriser:
100 - (8+x)²= 10²-(8+x)²= (10-8-x)(10+8+x)= (2-x)(x+18)
Développer:
3~ (x+1)² - (x-1)²= x²+2x+1-(x²-2x+1)= x²+2x+1-x²+2x-1= 4x
(x+1)² - (x-1)²= (x+1-x+1)(x+1+x-1)= 2(2x)
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Bonjour,
Développer :
1~ (x+1)² - 9= x²+2x+1-9= x²+2x-8
factoriser:
(x+1)²-9= (x+1)- 3²= (x+1-3)(x+1+3)= (x-2)(x+4)
Développer :
2~ 100 - (8+x)²
100- (64+16x+x²)= 100-64-16x-x²= -x²-16x+36
Factoriser:
100 - (8+x)²= 10²-(8+x)²= (10-8-x)(10+8+x)= (2-x)(x+18)
Développer:
3~ (x+1)² - (x-1)²= x²+2x+1-(x²-2x+1)= x²+2x+1-x²+2x-1= 4x
Factoriser:
(x+1)² - (x-1)²= (x+1-x+1)(x+1+x-1)= 2(2x)