Question

Which is a zero of the function f(x) = 2x - 10?

Answer 1

Watch carefully:

A 'zero' of the function is a value of 'x' that makes the function zero.

2x - 10 = 0

Add 10 to each side:

2x = 10

Divide each side by 2 :

x = 5

f(5) = 0

Answer 2

$f(x)=2x-10\\\\a\ zero\ if\ 2x-10=0\\\\2x=10\ \ \ /:2\\\\x=5\\\\Answer:The\ zero\ is\ x=5.$