The function f(x) is defined as f(x) = 3x²  5 for all real numbers x. What is f(4) ? A.) 149 B.) 53 C.) 29 D.) 43 E.) 139 Simply substitute 4, in for x, into the function:
f(4) = 3(4)²  5 {substitued 4 in for x} = 3(16)  5 {squared the 4} = 48  5 {multiplied 3 by 16} = 43 {subtracted} D.)  Algebra House
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