Without solving, find the nature of the roots.
Answer to Problem 2ST
two rational and different roots.
Explanation of Solution
Given:
The equation is :
Formula Used:
For the
If D >0 : If it is perfect square , the two roots are different and rational ; if it is not a perfect square , the two roots are different and irrational .
If D = 0 , then the roots are real and equal .
If D < 0 , then the roots are imaginary and conjugate.
Calculation:
The determinant of
Here a = 7 , b = -9 , c =2
Since 25 is a perfect square of 5.
So, the roots are two different and rational .
Chapter 7 Solutions
Algebra and Trigonometry: Structure and Method, Book 2
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