Write the quadratic equation whose roots are 1 and -2, and whose leading coefficient is 2

If roots are 1 and -2 then the two factors are:

(x - 1) (x + 2)

x^2 + 2x - 1x - 2 (used FOIL)

x^2 + x - 2 (combine terms)

Now, add leading coefficient is 2

2x^2 + x - 2

y = 2x^2 + x - 2

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