Question

Evaluate the function f(x) = −7x^2 + 10x when x = 2/3.

Answer 1

\[-7(\frac{2}{3})^2+10\times (\frac{2}{3})\]

Answer 2

i know that but im confused at the part where you square 2/3 cause when you square 2/3, doesn't it just go back to its original form?

Answer 3

http://www.wolframalpha.com/input/?i=-7%282%2F3%29^2%2B10%282%2F3%29

Answer 4

\[\left(\frac{2}{3}\right)^2=\frac{4}{9}\]

Answer 5

Ohh. I see it now. I got it mixed up with my other problem. thank you!