y=4x2-7x+b

It looks like you have a quadratic equation in the form \( y = ax^2 + bx + c \), where \( a = 4 \), \( b = -7 \), and \( c \) is a constant that you labeled as \( b \).

If you need help with this equation, please specify what kind of assistance you are looking for. Here are several possibilities:

1. Finding roots: We can find the roots of the equation using the quadratic formula.
2. Graphing: We can discuss how to graph this quadratic function.
3. Vertex: We can find the vertex of the parabola.
4. Value at specific points: We can calculate the value of \( y \) for specific values of \( x \).
5. Analyzing properties: We can discuss the properties of this quadratic function, such as its maximum or minimum.

Please provide more details on what you need!