Question

If 3x + 3y? - 42 and xy -15, find the value of (x - y
(2)​

Answer 1

$\red{\begin{gathered} \implies (3x - 3y)^2 \\ \implies 3^2 \times (x - y)^2 \\ \implies 9(x^2 + y^2 - 2xy) \\ \implies 9(42 - 2(8)) \\ \implies 9(42 - 16) \\ \implies 9\times (26) \\ \bold {\implies 234} \\ \end{gathered}}$