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41.

The product of all the real roots  of  x28x+98x+1x2=0 is 


A) 2

B) 1

C) 3

D) 7



42.

If the  line x+y+k=0 is a normal to the hyperbola  x29y24=1, then k

 


A) ±513

B) ±135

C) ±135

D) ±513



43.

The equation of tangent to the curve 

\left(\frac{x}{a}\right)^{n}+\left(\frac{y}{b}\right)^{n}=2  at the point (a,b)  is 


A) \frac{x}{a}=-\frac{y}{b}

B) \frac{x}{a}+\frac{y}{b}=2

C) \frac{x}{a}=\frac{y}{b}

D) \frac{x}{a}=\frac{y}{b}=n



44.

Let f(x) be a quadratic expression such that f(0)+f(1)=0.If f(-2)=0 , then 


A) f\left(\frac{-2}{5}\right)=0

B) f\left(\frac{2}{5}\right)=0

C) f\left(\frac{-3}{5}\right)=0

D) f\left(\frac{3}{5}\right)=0



45.

 The probability distribution of a  random variable  X is given below

 1482021379_m1.PNG

If  mean of X is 4.2,  then a and b are respectively equal to 


A) 0.3,0.2

B) 0.1,0.4

C) 0.1,0.2

D) 0.2,0.1



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