Question

What are the real values of x such that f(x)=0
f(x)=9xsquare - 25

Answer 1

\(\Huge 9x^2-25=0 \)
that can be written as the difference of squares... which can be factored.... can you factor that left hand side?

Answer 2

I can't.

Answer 3

\(\Huge 9x^2-25=0 \)
\(\Huge (3x)^2-5^2=0 \)

now try to factor using difference of squares.....

Answer 4

use this cheat sheet.... very handy.... it's the first one on page 2 in "factoring"....
http://tutorial.math.lamar.edu/pdf/Algebra_Cheat_Sheet.pdf

Answer 5

The real values are x= -5/3 and 5/3??