A polynomial is in standard form if it is written as follows:
`P(x) = ax^n + bx^(n-1) + cx^(n-2) +...`
The term with the highest degree comes first and is followed by the other terms in the order of decreasing powers of the variable.
To express the function
`f(x) = x(x-4)^2(x-8)(x^2+4)`
in standard form, let's first expand repeated factor.
The expanded form of the repeated factor is:
`@` `(x-4)^2=(x-4)(x-4) = x^2-4x-4x+16=x^2-8x+16`
The function becomes:
`f(x)=x(x^2-8x+16)(x-8)(x^2+4)`
...
A polynomial is in standard form if it is written as follows:
`P(x) = ax^n + bx^(n-1) + cx^(n-2) +...`
The term with the highest degree comes first and is followed by the other terms in the order of decreasing powers of the variable.
To express the function
`f(x) = x(x-4)^2(x-8)(x^2+4)`
in standard form, let's first expand repeated factor.
The expanded form of the repeated factor is:
`@` `(x-4)^2=(x-4)(x-4) = x^2-4x-4x+16=x^2-8x+16`
The function becomes:
`f(x)=x(x^2-8x+16)(x-8)(x^2+4)`
Then, multiply the factors. Let's start with the factors at the left.
`@` `x(x^2-8x+16)=x^3-8x^2+16x`
The function transforms to three factors.
`f(x)= (x^3-8x^2+16x)(x-8)(x^2+4)`
Then, multiply (x^3-8x^2+16x) with (x-8).
`@` `(x^3-8x^2+16x)(x-8)`
`=x^4-8x^3 -8x^3+64x^2+16x^2-128x`
`= x^4-16x^3+80x^2-128x`
f(x) is reduced to two factors.
`f(x) = (x^4-16x^3+80x^2-128x)(x^2+4)`
Multiply these two factors.
`@` `(x^4-16x^3+80x^2-128x)(x^2+4)`
`= x^6 +4x^4-16x^5-64x^3+80x^4+320x^2-128x^3-512x`
`= x^6 -16x^5+84x^4-192x^3+320x^2-512x`
The function is now converted to standard form.
Therefore the standard form of
`f(x) = x(x-4)^2(x-8)(x^2+4) `
is
`f(x)= x^6 -16x^5+84x^4-192x^3+320x^2-512x` .
No comments:
Post a Comment