Question

Using identity,find the square of the following (5y+3x)

Answer 1

Answer:

${(5y + 3x)}^{2} \\ = ) {(x + y)}^{2} = {x}^{2} + {y}^{2} + 2xy \\ = )( {5y)}^{2} + {(3x)}^{2} + 2 \times 5y \times 3x \\ = )25 {y}^{2} + {9x}^{2} + 30xy$