Precal question? need to see if im the right track?

Question

here is the equation

y = -3x^2 + 1/5

here are the answers that i got,

x = -3, y = 81.2

x= -2, y = 36.2

x= -1, y = 9.2

x = 0, y = .2

did i do it right or did i do something wrong?

Answer 1

Your answer will depend if the -3x² you have is written like:

This -3*x²; when x = -3, then y = -26.8,

or this -(3x)², when x = -3, then y = -80.8,

or this (-3x)², when x = -3, then y = 81.2.

The way you have it written is interpreted to be -1 × 3 × x².