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Maths, Addmaths and Statistics: Post your doubts here!

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Q. If the determinate of a matrix is zero, what does it tell ?
A That the matrix cannot be multiplied
B That the identity of that matrix does not exist
C That the ad joint of that matrix does not exist
D That the inverse of that matrix does not exist
 
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It is the only one that has 1 value of x for 1 value of y, in this case 3y=0, the gradient is 0, there y has one value only. It represents the X-AXIS, i.e y=0.
well if u sketch it, its a horizontal line (in fact the x axis)
and if u wanna do by elimination
then all the other options have power of x greater than 1 therefore they are curves......

thank you :)

can i ask some more questions ?
 
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Q. If the determinate of a matrix is zero, what does it tell ?
A That the matrix cannot be multiplied
B That the identity of that matrix does not exist
C That the ad joint of that matrix does not exist
D That the inverse of that matrix does not exist
The answer is D, since Adjoint/det. = Inverse of matrix, if det. = 0 then Inverse is undefined and hence does not exist.
 
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If the 16% increase in the basic salary of a government employee will become Rs. 3248 per month . What is his salary before the increase?
 
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Again take the arbitrary values, x=-2, x=0, x=2, x=4.
Take a appropriate scale and draw and extend the straight line.
 
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no the chapter of logarithmic and exponential functions itself
solving of exponential functions

when i started from past paper it was too difficult. i couldn't do ANY question from classified. i saw my teacher doing some questions which i asked him to solve and i got the common techniques to make the equations simple before solving. after few questions that topic has become easiest and my favourite chapter in whole syllabus.
 
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Q. Which of the following equation is linear equation ?
A. 3 y=0
B -x2+3x + 10 + 0
C 2x + 3xy- 5y = 0
D x(x2-2x4) = 25x + x3 + 30

a and c as maximum power of x and y is 1 in b there is x² term and in d x(x².... will turn it into x³ so it will be cubic not linear.
 
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