factorise 2x^2+3root5x-1
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x=1/5
2x^2+3=2×(1/5)^2+3
=2/25+3
=2+75/25
=77/25..
2x^2+3=2×(1/5)^2+3
=2/25+3
=2+75/25
=77/25..
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