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4\left(p^{2}+2pq+q^{2}\right)-4\left(p+q\right)p+p^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(p+q\right)^{2}.
4p^{2}+8pq+4q^{2}-4\left(p+q\right)p+p^{2}
Use the distributive property to multiply 4 by p^{2}+2pq+q^{2}.
4p^{2}+8pq+4q^{2}+\left(-4p-4q\right)p+p^{2}
Use the distributive property to multiply -4 by p+q.
4p^{2}+8pq+4q^{2}-4p^{2}-4qp+p^{2}
Use the distributive property to multiply -4p-4q by p.
8pq+4q^{2}-4qp+p^{2}
Combine 4p^{2} and -4p^{2} to get 0.
4pq+4q^{2}+p^{2}
Combine 8pq and -4qp to get 4pq.
4\left(p^{2}+2pq+q^{2}\right)-4\left(p+q\right)p+p^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(p+q\right)^{2}.
4p^{2}+8pq+4q^{2}-4\left(p+q\right)p+p^{2}
Use the distributive property to multiply 4 by p^{2}+2pq+q^{2}.
4p^{2}+8pq+4q^{2}+\left(-4p-4q\right)p+p^{2}
Use the distributive property to multiply -4 by p+q.
4p^{2}+8pq+4q^{2}-4p^{2}-4qp+p^{2}
Use the distributive property to multiply -4p-4q by p.
8pq+4q^{2}-4qp+p^{2}
Combine 4p^{2} and -4p^{2} to get 0.
4pq+4q^{2}+p^{2}
Combine 8pq and -4qp to get 4pq.