The difference between a number and twice it's reciprocal is 17/10.
multiply each term by 10x 10x^2 - 20 = 17x 10x^2 - 17x - 20 = 0 (5x + 4)(2x - 5) = 0 so x = -4/5 or x = 5/2 check: reciprocal of 5/2 is 2/5 twice the reciprocal is 4/5 evaluate 5/2 - 4/5 = (25-8)/10 = 17/10 I will let you check the other the same way
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