Board Thread:Fun and Games/@comment-33380803-20171105051122/@comment-33380803-20171105054640

BobbytheBlobby wrote: Wanna do a quadratic equation?

2 y 2  - y - 15 = 13

Find all possible values of y. Although i like using x. 2y^2 - y - 28 = 0 A = 2 B = -1 C = -28 PLug in taht quadratic formula: X = -b +- (square root of (b squared - 4ac)) / 2a X = 1 +- (square root of (1 + 48)) / 4 X = 1 + 7/4 X = 2.75 So possible values for y are 2.75 and - 2.75

Now if you just wanted to find how many real roots there are, work out if the part in teh square root is positive,negative or 0.

Square root of (b squared - 4ac) = square root of 49 = 7 which is positive. Therfore there are 2 real roots. (Also, you didn’t specify that you wanted to find all real roots or include not real roots)

Did I do it right?