Question

Add the following expressions:

p² – q + r, q² – r + p and r² – p + q

Answer 1

We have, p² – q + r + (q² – r + p) + (r² – p + q)

= p² – q + r + q² – r + p + r² – p + q

On combining the like terms,

= p² + q² + r² – q + q + r – r + p – p

= p² + q² + r² + 0 + 0 + 0

= p² + q² + r²