Evaluating a function: formula

Sal Khan

https://www.khanacademy.org/math/algebra/algebra-functions/evaluating-functions/v/understanding-function-notation-example-1

A quadratic function, concave down, which is symmetrical about the y-axis intercepting the y-axis at 49, f(x)=49-x^2, is evaluated at x=5. Determine f(5). Use of functional notation

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