Q. Solve the equation by factoring:x3−8x2−9x=0Answer: x=
Factor GCF: Factor out the greatest common factor (GCF) from the equation x3−8x2−9x=0. The GCF is x, so we factor it out to get x(x2−8x−9)=0.
Factor Quadratic Equation: Now we need to factor the quadratic equationx2−8x−9. We look for two numbers that multiply to −9 and add up to −8. The numbers are −9 and +1. So we can write the quadratic as (x−9)(x+1).
Find Roots: Now we have the factored form of the equation: x(x−9)(x+1)=0. To find the roots, we set each factor equal to zero and solve for x.
First Root: Set the first factor equal to zero: x=0. This gives us the first root.
Second Root: Set the second factor equal to zero: x−9=0. Solving for x gives us x=9, which is the second root.
Third Root: Set the third factor equal to zero: x+1=0. Solving for x gives us x=−1, which is the third root.
More problems from Quadratic equation with complex roots