i keep getting 379.5 and 519.753968 as the roots, which according to my text is wrong
solving this using quadratic formula
252x^2 + 188x - 225 = 0
i got (-188± √188^2 - 4*252*-225)/504
but even when I compute it I must be making a mistake because I do not get the right answer
i found this online (from a quadratic calculator)
−188±512* square root 1
----------------------------
504
how does one know to multiply by the square root of one?
I thought the formula called for the square root of b^2-4ac, and if b^2-4ac comes out to 262114 then it's root is 512, where does the 'times the square root of one' come in?
MH