Question

a square (2ab-5c) i want this answer immediately

Answer 1

${(a - b)}^{2} = {a}^{2} - 2ab + {b}^{2}$

Therefore,

$= {(2ab)}^{2} - 2 \times 2ab \times 5c + {(5c)}^{2} \\ = 4 {a}^{2} {b}^{2} - 20abc + 25 {c}^{2}$