1) 2x²-5=(x-1)(x+1)
2x²-5=x²-1
2x²-x²=5-1
x²=4
x=2 или x=-2
2) 2x²-13=(x-2)(x+2)
2x²-13=x²-4
2x²-x²=13-4
x²=9
x=3 или x=-3
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Answers & Comments
1) 2x²-5=(x-1)(x+1)
2x²-5=x²-1
2x²-x²=5-1
x²=4
x=2 или x=-2
2) 2x²-13=(x-2)(x+2)
2x²-13=x²-4
2x²-x²=13-4
x²=9
x=3 или x=-3