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X^2-121=0⇒ x=11∧ x= -11
3x^2-48=0⇒x²=16⇒x=4∧x=-4
4x^2-4=0⇒x²=1⇒x=1∧x=-1
5x^2-125=0⇒x²=25⇒x=5∧x=-5
3x^2-27=0⇒x²=9⇒x=3∧x=-3