Try to draw the geometrical figures for other identities.
(x+y)=r+ 2xy + y? (i) (+y)(x - y)=x2 - y2
(x+aXx+b)=r +(a+b)x+ab
(iv) (x+aXx+b)x+c)=x+(a+b+c)x2 +(ab + bc + ca)x+ abc
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