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x²-6x+4=0

CBSE Class X 2011 : MATHEMATICS
	answer is 1.967cm² prateek13

speed=xkm/hr.Distance=180km.

Time=180/x

New speed=(x+9)km/hr.Distance=180km.

Time=180/x+9

By the given condition,

(180/x)-(180/x+9)=1

(180)(1/x-1/x+9)=1

(x+9-x/x²+9x)=1/180

x²+9x-1620=0

(x-36)(x+45)=0

x=36km/hr.

Therefore the speed is 36km/hr.

10=√[y-(-1)]²+(11-3)²

100=(y+1)²+64

(y+1)²=36

y+1=6

y=5

CBSE Class X 2011 : MATHEMATICS
	prateek13


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