(x²+5)²=144
1) x²+5= 12
x²=7
x1= √7
x2= -√7
2) x²+5= -12
x²≠ -17
x1*x2= √7*(-√7)= -7
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(x²+5)²=144
1) x²+5= 12
x²=7
x1= √7
x2= -√7
2) x²+5= -12
x²≠ -17
x1*x2= √7*(-√7)= -7