Answer and Explanation
Your Answer is
Correct Answer is E
Explanation
Assuming x^2=t, the original equation can be transformed into: t²+21t-100=0, and the E option can be obtained by solving this quadratic equation
Your Answer is
Correct Answer is E
Explanation
Assuming x^2=t, the original equation can be transformed into: t²+21t-100=0, and the E option can be obtained by solving this quadratic equation