Answer:
x= ± √10
2
Step-by-step explanation: Use Pagathorium Theory
x^2+3x^2 = 10
4x^2 = 10
2x^2 = 5
2x^2-5=0
x^2-5/2=0
x= -0±√0^2+5/2
x=±√5/2
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