Posted by Amy on Sunday, September 12, 2010 at 5:17pm.
Find all roots:
#1.) 2x^3 + 5x^2  22x + 15 = 0
#2.) x^4 + 4x^3 + 6x^2 + 8x + 8 = 0

Math  Find all roots  MathMate, Sunday, September 12, 2010 at 7:02pm
#1
2x^3 + 5x^2  22x + 15 = 0
Did you notice that the coefficients of the equation add up to zero?
This means that (x1) is a factor.
Divide the lefthandside by (x1) using long division and solve the resulting quadratic equation by factoring.
#2
If the coefficient of x^4 is 1 and the constant term is 8, the possible real rational factors are (x+1), (x+2), (x+4) or (x+8). Try these factors and reduce the expression by long division. Repeat until no more factors can be found.
Hint: there are two complex roots for this equation, so you will only find two real roots.
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