Question

A quadratic graph has equation y = (x-1)(x+7)
Find the values of a, b and c.

Answer 1

`a=1,\,b=6,\,c=-7`

Explanation:

`y=(x-1)(x+7)\\y=x^2+6x-7\\y=1x^2+6x-7\\\\a=1,\,b=6,\,c=-7`

You're just getting the coefficients (and constant at the end) after expanding.