What is true about the solutions of a quadratic equation when the radicand of the quadratic formula is a positive number that is not a perfect square?

A. No real solutions

B. Two identical rational solutions

C. Two different rational solutions

D. Two irrational solutions

Respuesta :

The answer that is true about the solution of a quadratic equation when the radicand of the quadratic formula is a positive number that is not a perfect square is two irrational solutions. The correct answer is D. 

Answer:

Option D Two irrational solutions

Step-by-step explanation:

Any quadratic equation of the form would be

[tex]ax^2+bx+c=0[/tex]

We can solve this by completion of squares.

Multiply by 4a

[tex]4a^2x^2+4abx+4ac=0\\(2ax+b)^2-b^2+4ac=0\\(2ax+b)^2=b^2-4ac\\2ax+b=\sqrt{b^2-4ac} \\x=\frac{-b+or -\sqrt{b^2-4ac} }{2a}[/tex]

Thus we find the solution as above

The square root if 0 we have two equal solutions

If perfect square we have two rational solutions

But here given that the discriminant b^2-4ac is positive but not perfect square

Hence the square root would be irrational thus the solution also would be irrational

Hence answer is

Option D Two irrational solutions

Q&A Education