Question

(p+q)(p-q)+(p+r)(r-p)-(r2-q2) please help me any one kal mera test hai please koi batao Ayush yadav and Mohan brijwal kaise aya step bataiye
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Answer 1

Answer:

(p+q)(p-q)+(p+r)(r-p)-(r2-q2)

= (p^2 - q^2) - (p^2 - r^2) - (r^2 - q^2)

= p^2 - q^2 - p^2 + r^2 - r^2 + q^2

= 0