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What is the y-intercept of f(x)=x^2-4?

Answer and explanation

Correct answer: -4

The governing concept is finding a y-intercept. Every point on the y-axis has x-coordinate 0, so substitute x=0 into the function. We obtain f(0)=0^2-4=0-4=-4. Therefore the graph meets the y-axis at the point (0,-4), and the requested y-coordinate is -4, making option B correct. The value 4 results from losing the negative sign. The value 0 is the squared part before subtracting 4, not the final function value. The value 2 is unrelated to the y-intercept; it may arise from confusing this question with solving a different equation. Remember that y-intercepts are found by setting x equal to zero, whereas x-intercepts require setting y, or f(x), equal to zero.

Related tags

Relations-FunctionsY-InterceptQuadratic-FunctionGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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