Question

expand the following (1+2x-3y)2

Answer 1

HEY

Identity used

${(a + b - c)}^{2} \\ \\ = {a}^{2} + {b}^{2} + {c}^{2} + 2ab - 2bc - 2ca$

${(1 + 2x - 3y)}^{2} \\ \\ {(1)}^{2} + {(2x)}^{2} + {(3y)}^{2} + 2 \times 1 \times 2x \\ - 2 \times 2x \times 3y - 2 \times 3y \times 1 \\ \\ \\ 1 + 2 {x}^{2} + 3 {y}^{2} + 4x - 12xy - 6y$

Answer 2

Answer:

1+4x^2+9y^2+2((1) (2x) +(2x) -(3y) +(-3y(1))

1+4x^2+9y^2+2(2x-6xy-3yl

1+4^2+9y^2+4x-12xy-6y ans