q^(2)-10q+21

Factorize each of the following quadratic polynomials by using the method of completing the square: (1) p^2+6p+8 (2) q^2-10 q+21 (3) p^2+6p-16

I. 3p^(2) + 17p+10 = 0 II. 10q^(2) +9q+2=0

Four point charges q_(1),q_(2),q_(3)" and " q_(4) are placed at the corners of the squares of side a,as shown in figure.Calculate the potential at the centre of the square. (Given, q_(1)=1xx10^(-8)C,q_(2)= -2xx10^(-8)C,q_(3)=3xx10^(-8)C,q_(4)=2xx10^(-8)C" and " a=1m )

(10p + q) (10q + p)=