Question

(3x-y)2=?
Ajutor va rog

Answer 1

${(3x - y)}^{2} = {(3x)}^{2} - 2 \times 3x \times y + {y}^{2} \\ = {3}^{2} \times {x}^{2} - 6xy + {y}^{2} \\ = 9 {x}^{2} - 6xy + {y}^{2}$