1. 100y kuadrat - 9= jawab pake cara aljabar! 2. 81 kuadrat -79 kuadrat= jawab pake cara aljabar

[tex]1) \hspace{1 mm} 100y^2 - 9\\ = (10y)^2 - 3^2 \\ = (10y + 3)(10y - 3) \\ \\ 2) \hspace{1 mm} 81^2 - 79^2 \\ = (81 + 79)(81 - 79) \\ = 160 * 2 \\ = 320[/tex]