Question

Determine a expressão que representa (√12-7)².

Answer 1

$( \sqrt{12} - 7 )^2 \\ \\ \\ ( \sqrt{12} - 7 ) *( \sqrt{12} - 7 ) \\ \\ \\ (\sqrt{12})^2 - 7 \sqrt{12} - 7 \sqrt{12} + 7^2 \\ \\ \\ (\not \sqrt{12})^\not^2 - 7 *2\sqrt{3} - 7 * 2 \sqrt{3} + 49 \\ \\ \\ 12 -28 \sqrt{3} + 49 \\ \\ \\ => 61 -28 \sqrt{3}$