Basic algebra formulas that you can revise anytime and anywhere

FORMULAS FOR BEGINNER (a+b) ^2= a^2+b^2+2ab (a+b) ^2= (a-b) ^2+4ab (a-b) ^2= a^2+b^2-2ab (a-b) ^2= (a+b) ^2-4ab a^2+b^2= (a+b) ^2-2ab a^2+b^2= (a-b) ^2+ 2ab a^2-b^2= (a+b) (a-b) (a+b+c) ^2= a^2+b^2+c^2+2(ab+bc+ac) (a-b-c) ^2= a^2+b^2+c^2-2(ab-bc+ac) (a+b) ^3= a^3+b^3+3ab(a+b) (a-b) ^3= a^3-b^3+3ab(a-b) a^3+b^3= (a+b) (a^2-ab+b^2) a^3-b^3= (a-b) (a^2+ab+b^2) a^4-b^4= (a^2-b^2) (a^2+b^2) = (a^2+b^2) (a+b) (a-b) a^5+b^5= (a+b) (a^4-a^3b+a^2b^2-ab^3+b^4) a^5-b^5= (a-b) (a^4+a^3b+a^2b^2+ab^3+b^4)

pepper-salt and filtered image

clc;
close all;
clear all;
q=imread('BIRDS.jpg');
p=rgb2gray(q);
k=imnoise(p,'salt & pepper', .5);
c= medfilt2(k,[3 3]);
d= medfilt2(k,[5 5]);
e= medfilt2(k,[7 7]);

figure;

subplot(2,3,1),imshow(q),title('original image');
subplot(2,3,2),imshow(p),title('Grayscale image');
subplot(2,3,3),imshow(k),title('noisy image');
subplot(2,3,4),imshow(c),title('filtered 3x3 image');
subplot(2,3,5),imshow(d),title('filtered 5x5 image');
subplot(2,3,6),imshow(e),title('filtered 7x7 image');


OUTPUT:

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Basic algebra formulas that you can revise anytime and anywhere