The vertex form of the equation of a parabola is x=8(y-1)^2-15. what is the standard form of the equation?

The standard form of the equation  is:

We know that the standard form of a quadratic equation is given by the expression:

where a,b and c are real numbers.

and a≠0

Here we are given the  vertex form of the equation of a parabola by:

Now, on expanding the parentheses term by using the formula:

Here a=y and b= 1

Hence, we have:

( Since, in the last step we combined the constant term i.e. 8 and -15 )

Hence, we get the standard form of the equation as:

ab will be equal to