Question

Resolva a equação (9 + x).(12 + x) = 270​

Answer 1

Resposta:

108 +9x +12x +x²=270

x²+ 21 x -162 =0

◇= 21² -4 . 1. (-162)

◇= 1089

x= -21 +- 33

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2

x'= -21+33/2

x'= 6

x"= -21-33/2

x"= - 27