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To identify the `y`-intercept of a quadratic function from its equation, substitute \( x = 0 \) into the equation \( y = ax^2 + bx + c \). This point corresponds to the value of the function when \( x = 0 \). It provides crucial information about the initial value or starting point of the quadratic function on the vertical axis, irrespective of its parabolic shape.

Algebra 2

Quadratic Functions