Answered

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71
Factoriser.
a) y2 - 22y + 121
c) 100 - x2
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b) 49 - 14x + x2
d) y2 + y + 0,25
Merci beaucoup

Sagot :

TEAMCE

Réponse :

Bonsoir,

a)

y²-22y+121

=y²-(2*11*y)+11²

--> a²-2ab+b²= (a-b)²

= (y-11)²

c)

100-x²

=10²-x²

--> a²-b²= (a-b)(a+b)

=(10-x)(10+x)

b)

49-14x+x²

=x²-(2*7*x)+7²

-->  a²-2ab+b²= (a-b)²

=(x-7)²

d)

y²+y+0,25

=y²+(2*0,5*y)=0.5²

--> a²+2ab+b²= (a+b)²

= (y+0,5)²

Bonne soirée.