Question

Resolva a equação : $\left[\begin{array}{ccc}2&5&\\x&5\\\end{array}\right] = \left[\begin{array}{ccc}x&1&\4&4&x\\\end{array}\right]$

Answer 1

2.5-5x=x²-4

10-5x=x²-4

x²+5x-4-10=0

x²+5x-14=0

Por Bhaskara:

x'=2

x''=-7

Resposta:  x'=2  e  x''=-7