Question

Simplify - (3x+y-5)(3x-y-5)

Answer 1

Answer:

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Step-by-step explanation:

$3x(3x - y - 5) + y(3x - y - 5) - 5(3x - y - 5) \\ 9 {x}^{2} - 3xy - 15x + 3xy - {y}^{2} - 5y - 15x + 5y + 25 \\ 9 {x}^{2} - {y}^{2} + 25$