Question

determine o valor real de x na expressão x - ( 5√ 243 + 3√125) =15​

Answer 1

$x - (5\sqrt{243} + 3\sqrt{125} ) = 15\\x - (5\sqrt{3^5} + 3\sqrt{5^3} ) = 15\\x - (5\sqrt{3^2 * 3^2 * 3} + 3\sqrt{5^2 * 5} ) = 15\\x - (5 * 3 * 3\sqrt{3} + 3 * 5 \sqrt{5} ) = 15\\x - (45\sqrt{3} + 15\sqrt{5} ) = 15\\x = 15 + (45\sqrt{3} + 15\sqrt{5} )$