Respuesta :
b2 - 4ac
(whatever that 4's sign is it is positive when squared )
(4)2 - 4(2)(- 9)
16 + 72 = 88
===============Two real roots.
Answer:
Answer is 88
Step-by-step explanation:
Given is a quadratic expressions as
[tex]2x^2 + 4x - 9[/tex]
We have to find the discriminant.
Compare this to std form of quadratic as
[tex]ax^2 + bx +C[/tex]
We have a=2, b =4 and c =-9
ac = -18
b^2 =16
Hence discriminant =
[tex]b^2-4ac \\=16-4(-18)\\=16+72\\=88[/tex]
