The required function is
y = x(x + 3)(x + 1)(x - 6)
What is a function?
A function from A to B is a rule that assigns to each element of A a unique element of B. A is called the domain of the function and B is called the codomain of the function.
There are different operations on functions like addition, subtraction, multiplication, division and composition of functions.
Here,
The function has zeroes at x = -3, -1, 0 and 6
The required function is
y = (x - (-3))(x - (-1))(x - 0)(x - 6)
y = x(x + 3)(x + 1)(x - 6)
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