" Real rumber "

Real Numbers

Real Number and Real Number line

The expression ax^2+2bx+c , where 'a' is non-zero real number, has same sign as that of 'a' for every real value of x,then roots of quadratic equation ax^2+ (b-c) x-2b-c -a-0 are: (a) real and equal (b) real and unequal (c) non-real having positive real part(d) non-real having negative real part

The set of all real numbers is

Real Image

Real image

Calculate the wave rumber of yellow light of wavelength 585 nm.

The numbers 1,2,..,10 are written on the board.A person can pick two numbers,a and b on the board,erase them,and replace them with the number a +b-1. (a) How many xx can one repeat this process unti there is just one rumber on the board?

The expression ax^(2)+2bx+c, where 'a' is non-zerr real number,has same sign as that of a' for every real value of x,then roots of quadratic equation ax^(2)+(b-c)x-2b-c-a-0 are: (a) real and equal (b) real and unequal (c) non-real having positive real part(d) non-real having negative real part