Question

Qual o resultado ? X²=3²+15²

Answer 1

255 = x² + (x² +6x + 9)

2x² + 6x - 216 = 0

delta = 36 + 1728

raíz de delta = 42

x' = [ -(+6) + 42 ] / 2*(+2)

x' = +36/4

x' = +9

x'' = [ -(+6) - 42 ] / 2*(+2)

x'' = - 48 / 4

x'' = -12

S = {-12, +9}