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pan90
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Answer is given, but no explanation or logic for it.
View attachment 9220
From HiSet free practice test
View attachment 9220
From HiSet free practice test
You need to show what you have tried, even if it is wrong. That will enable us to help you better.pan90 said:Answer is given, but no explanation or logic for it.
From HiSet free practice test
A cubic equation is a polynomial equation of the form ax^3 + bx^2 + cx + d = 0, where a, b, c, and d are constants and x is the variable. It is called a cubic equation because the highest power of x is 3.
The roots of a cubic equation can be found by factoring, using the quadratic formula, or by using synthetic division. In this case, we can use the quadratic formula since we know that the roots are complex numbers.
The steps to find the cubic equation with -1 and 2i as roots are:
Yes, a cubic equation can have complex roots. In fact, every cubic equation has either three real roots or one real root and two complex roots.
You can check if your cubic equation is correct by substituting the roots into the equation and verifying that it equals 0. You can also graph the equation and see if the x-intercepts match the given roots.