Solve -5sqrtx = -15. A. x = -9 B. x = 7 C. x = 9 D. x = -7
2 answers:
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Answer:
The answer is D.
Step-by-step explanation:
We have to apply Discriminant Law. When a quadratic equation, ax² + bx + c = 0 has equal roots so the discriminant will be 0. Then, you have to substitute the values into the formula :
