Question

Ayuda por favor con esta operación:
2(2-3√2)²+(2-3√2)(2+3√2)

Answer 1

* (a-b)² = a² + 2ab + b²
* (a+b)(a-b) = a² - b²
-->
   2(2-3√2)²+(2-3√2)(2+3√2)
= 2(2²-2(2)(3√2)+(3√2)²) + 2² - (3√2)²
= 2(4 - 12√2+9(2)) + 4 -9(2)
= 44 - 24√2 + 4 - 18
= 30 - 24√2 = 6 (5 - 4√2)