Hi everyone! I have a question about rounding numbers:
When using rounding arithmetic, do I have to round the number after I complete the whole operation or do I have to round them during every step? For example: I was asked to get an approximation of one of the roots of (1/3)x^2-(123/4)x+1/6=0, using the formula x1=(-2c)/(b+sqrt(b^2-4ac)) with 4-digit rounding arithmetic. Do I have to substitute directly the values of a, b and c and round the number I get or do I have to use the rounded values in the formula (e.g. 0.1667 instead of 1/6)?
Someone told me that I have to do it using the rounded values in the formula, however I got a 0 on the denominator. If someone could show me step by step how to do this exercise I'd be very grateful.
Nevermind. I found out that I can't use that formula because the value of b is negative and I instead I must use the general quadratic formula to get the approximation.