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=4a-9b
(2√a + 3√b)(2√a - 3√b)
Puedes aplicar productos notables (a + b)(a - b) = a² - b²
(2√a + 3√b)(2√a - 3√b) =
(2√a)² - (3√b)² =
2²(√a)² - 3²(√b)² =
4a - 9b
Otra forma de hacerlo.
2√a + 3√b
2√a - 3√b
----------------------------
4(√a)² + 6√a√b
- 6√a√b - 9(√b)²
----------------------------------
4a -9b
Respuesta
4a - 9b