Grade 12 Advanced Functions
posted by Rebecca .
One zero of f(x)=x^3+4x^2+x+c is -3.
a) calculate the value of c.
b)calculate the other zeros.
Ummm, didn't MathMate just do one of these for you? Plug in -3 and evaluate to find c.
Ummmmm, I needed help with the second part
Divide by x+3 and see what you get:
x^3 + 4x^2 + x -6
= (x+3)(x^2 + x - 2)
Got it now?
what about this question:
Determine the roots algebraically by factoring.