Question

---b.f(x) = x3 - 4x2 - 9x + 36© f(x) = x4 – 25x2 + 144Of(x) = 27X3 – 18x2 + 3x

Answer 1

Letter D is:

`f(x)=27x^3-18x^2-3x`

'3x' is a common factor between all coefficients, thus:

`f(x)\text{ = 3x}(9x^2-6x-1)`

We can continue and factor 9x^2 - 6x - 1 but we have to find the roots (applying the Bhaskara equation to find the roots):

`x\text{ = }\frac{6\pm\sqrt[]{36-4*9*(-1)}}{2*9}`