Use the Discriminant to find the nature of roots of the following relation: y=-2x^2+9x-7. DO NOT SOLVE.
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Answered by
4
Answer:
use the formulas of b^2 -4ac
=(9)^2-4×2×-7
=81+56
=137
Step-by-step explanation:
answer
Answered by
2
Answer:
Step-by-step explanation:
y = ax² + bx + c ;
D = b² - 4ac ;
If D ≥ 0 , then the quadratic equation roots are from the set of real numbers.
If D < 0 , then quadratic equation has two imaginary roots.
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y = - 2x² + 9x - 7
a = - 2 , b = 9 , c - 7
D = 9² - 4(- 2)(- 7) = 25 > 0 ===> Two roots of given quadratic equation are real numbers.
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