Embarrassing but I have this equation:
If I use my calculator's quadratic mode I get the correct answer.
However, if I try to do it manually I get a problem because 16 - 4 x 4 x 840.15 gives a negative number, which I cannot square root?
2026-04-06 04:55:10.1775451310
Quadratic formula- calculator gives an answer but cannot do it manually
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check the sign of the term $c=-840*.158$ is negative and the formula $$b^2-4ac$$