Question

Find the value of discriminant of y2+2y-9=0​

Answer 1

Step-by-step explanation:

discriminant =b²-4ac

in this equation a=1,b=2,c=-9

so d=(2)²-4×-9×1

d=-32

as d<0 so it has no real roots

Answer 2

The answer is 40

Given:  $y^{2} +2y +9 = 0$  

To find: Discriminant of given equation

Solution: Compare given equation with ax²+bx+c=0  then we have

a = 1, b = 2 and c = -9

As we know discriminant of ax² + bx + c = 0 is b²- 4ac

Substitute the above values in formula

Discriminant of $y^{2} +2y +9 = 0$  

⇒ b²- 4ac =  (2)² - 4(1)(-9) = 4 + 36 = 40  

Therefore, Discriminant of given equation = 40

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