Which polynomial function has x intercepts -1, 0, and 2 and passes through the point (1, -6)

Answers

f(x) = 3x^3 - 3x^2 - 6x

Step-by-step explanation:

Which polynomial function has x intercepts -1,0, and 2 and passes through the point (1,-6)?

There are 3 distinct and real roots given in the question, which means that the  function must be a third degree polynomial. The roots are -1, 0, and 2. This means that f(x) = 0 at these points. The general form of the cubic equation is given by:

f(x) = ax^3 + bx^2 + cx + d; where a, b, c, and d are arbitrary constants.

From the given data:

f(-1)=0 implies a*(-1)^3 + b*(-1)^2 + c(-1) + d = -a + b - c + d = 0. (Equation 1).

f(0)=0 implies a*(0)^3 + b*(0)^2 + c(0) + d = 0a + 0b + 0c + d = 0. (Equation 2).

f(2)=0 implies a*(2)^3 + b*(2)^2 + c(2) + d = 8a + 4b + 2c + d = 0. (Equation 3).

f(1)=0 implies a*(1)^3 + b*(1)^2 + c(1) + d = a + b + c + d = -6. (Equation 4).

Equation 2 shows that d = 0. So rest of the equations become:

-a + b - c = 0;

8a + 4b + 2c = 0;  (Divide 2 on both sides of the equation to simplify).

a + b + c = -6

This system of equation can be solved using the Gaussian Elimination Method. Converting the system into the augmented matrix form:

•111|-6  

•-11-1|0

•421|0

Adding row 1 into row 3:

•111|-6  

•020|-6

•421|0

Dividing row 2 with 2 and multiplying row 1 with -4 and add it into row 3:

•11        1|-6

•01       0|-3

•0-2-3|24

Multiplying row 2 with 2 and add it into row 3:

•11       1|-6

•01       0|-3

•00-3|18

It can be seen that when this updated augmented matrix is converted into a system, it comes out to be:

•a + b + c = -6

•b  = -3

•-3c = 18 (This implies that c = -6.)

Put c = -6 and b = -3 in equation 1:

•a + (-3) + (-6) = -6

•a = -6 + 3 + 6

•a = 3.

So f(x) = 3x^3 - 3x^2 - 6x (All conditions are being satisfied)!!!



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