Add: p – q and q – r
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Answer:
p-r is answer
Step-by-step explanation:
p-q+q-r
= p-r
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p (p-q) = p^2-pq
q (q-r) = q^2-qr
and
r (r-p) = r^2-rp
Therefor add them together = p^2-pq + q^2-qr + r^2-rp
= p^2 + q^2 + r^2 - pq - qr - rp
q (q-r) = q^2-qr
and
r (r-p) = r^2-rp
Therefor add them together = p^2-pq + q^2-qr + r^2-rp
= p^2 + q^2 + r^2 - pq - qr - rp
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