Question

2) Calcule :

a) √13elevado a 2 - √12 elevado a 2

Answer 1

    $\sqrt{13^2-12^2} = \sqrt{(13+12)(13-12)} = \sqrt{25 . 1} = \sqrt{25} =5$

Answer 2

√13²-12²=√169-144=√25=5
foi?