To convert the quadratic function \( f(x) = (x + 4)^2 \) into standard form, we need to expand and simplify it.
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Start with the given function: \[ f(x) = (x + 4)^2 \]
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Expand the square: \[ f(x) = (x + 4)(x + 4) \] \[ f(x) = x^2 + 4x + 4 \]
Thus, the equation of the quadratic function in standard form \( ax^2 + bx + c \) is: \[ f(x) = x^2 + 4x + 4 \]
So, the standard form of the function is \( f(x) = x^2 + 4x + 4 \).