Question

Use the discriminant to find the number and type of roots: -7x + 15x2 - 4 = 0.

Answer 1

discriminant is \(b^2 - 4ac\)

Answer 2

the general equation is of form ax² + bx + c
compare your equation with the general form and find the value of a b and c
and the put those values in the formula for discriminant as mentioned by @lgbasallote

Answer 3

first of all :
\[\huge{\textbf{Welcome to openstudy}}\]
Regarding quadratic equations : i have posted a tutorial : you can prefer that :
http://openstudy.com/study#/updates/4fe09fa0e4b06e92b86fbb47
and this one
http://openstudy.com/study#/updates/4fe08815e4b06e92b86fa074