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Video: Evaluating Quadratic Functions

Bethani Gasparine

Find the value of 𝑓(√2) given the function 𝑓(𝑥) = 𝑥² + √2 𝑥.


Video Transcript

Find the value of 𝑓 of square root two given the function 𝑓 of 𝑥 equals 𝑥 squared plus square root two 𝑥.

So in order to find the value of 𝑓 of square root two, we need to plug in square root two for 𝑥. So we are replacing the 𝑥s with square root two, and now we evaluate.

Square root two squared is two, and square root two times square root two is also two, and two plus two equals four.