- 2x^2+x-15=0 I use the quadratic formula but im not getting -3 and 5/2 as my solution.?

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SN1 reaction between 2- chloro 2- methylpropane and NaCN? What will be derivative of : (sqrt(a + x) - sqrt(a - x)) / (sqrt(a + x) + sqrt(a - x))? What any normal household weighs 500 grams? Find the polynomial w/ smallest degree w/ rational coefficients that has roots (2 - i√ 3), (2 + i√ 3) and 1 of muntiplicity 2? What are the odds of rolling double of the same number 4 times in a row (Ex: Roll double 3s 4 times in a row)?