E urgent, dau coroană..!!!

Răspuns:
3.
a). x^2=25
x=±✓25
x=±5
b). x^2=49
x=±✓49
x=±7
c). x^2=144
x=±✓144
x= ±12
d). 2x^2=200
x^2=200/2
x^2=100
x=±✓100
x=±10
e). x^2+1=82
x^2=82-1
x^2=81
x=±✓81
x=±9
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