Answer:
option C is FALSE, i.e. Completing the square can be used to solve the given equation.
Explanation:
Given the problem is x³ + 7x + 9 = 0.
We can solve the problem using "Complete Square method" if it is given in the quadratic form of x² + 2ax + a² = 0 with degree 2.
We see that given problem has degree 3 instead of 2, so we can not complete the square in this problem.
So we have some TRUE facts:-
A. Completing the square can not be used to solve the given equation.
B. Completing the square can only be used to solve a quadratic equation.
D. Completing the square can not be used because of the x³ term.
It means the only False fact is that:-
C. Completing the square can be used to solve the given equation.
Hence, option C is FALSE, i.e. Completing the square can be used to solve the given equation.