Question

Find the square of 1)ab-bc-ca 2) 5a^2 +2b^2​

Answer 1

${(ab - bc - ac)}^{2} \\ {a}^{2} {b}^{2} + {b}^{2} {c}^{2} + {a}^{2} {c}^{2} - 2a {b}^{2}c - 2 {a}^{2} bc + 2ab {c}^{2}$
${(5 {a}^{2} + 2 {b}^{2} ) }^{2} \\ 25 {a}^{4} + 4 {b}^{4} + 20 {a}^{2} {b}^{2}$