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(a) Add: p(p-q), q(q-r) and r(r-p) ...

(a) Add: `p(p-q), q(q-r) and r(r-p)`
(b) add: `2x(z-x-y) and 2y(z-y-x)`
(c) Subtract: `3l(l-4m+5n)` from `4l(10n-3m+2l)`
(d) Subtract: `3a(a+b+c)-2b(a-b+c)` from `4c(-a+b+c)`

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Let's solve each part of the question step by step. ### (a) Add: `p(p-q), q(q-r) and r(r-p)` 1. **Expand each expression:** - \( p(p - q) = p^2 - pq \) - \( q(q - r) = q^2 - qr \) - \( r(r - p) = r^2 - rp \) ...
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