How to find two function inputs with the same output given graph (example) | Khan Academy

Sal finds the input value other than -5 for which f(x)=f(-5), given the graph of f.

Algebra I on Khan Academy: Algebra is the language through which we describe patterns. Think of it as a shorthand, of sorts. As opposed to having to do something over and over again, algebra gives you a simple way to express that repetitive process. It's also seen as a "gatekeeper" subject. Once you achieve an understanding of algebra, the higher-level math subjects become accessible to you. Without it, it's impossible to move forward. It's used by people with lots of different jobs, like carpentry, engineering, and fashion design. In these tutorials, we'll cover a lot of ground. Some of the topics include linear equations, linear inequalities, linear functions, systems of equations, factoring expressions, quadratic expressions, exponents, functions, and ratios.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to Khan Academy’s Algebra channel:

[girlygirly]

I still don't get it, how did you get the graph line?

[akshayrajput]

Sir, I have a doubt. I think only you can solve it. This doubt is bothering me a lot.
"We know that a single input in a function cannot have multiple outputs but in f(x)=√x, for x=4, outputs are +2 and -2
Please explain this chaos"
It will be very very very very kind if you explain this to me🙏🙏🙏🙏🙏