Y=3(X+a)(X-b)

Solution for Y=3(X+a)(X-b) equation:

Simplifying
Y = 3(X + a)(X + -1b)

Multiply (X + a) * (X + -1b)
Y = 3(X(X + -1b) + a(X + -1b))
Y = 3((X * X + -1b * X) + a(X + -1b))
Y = 3((X2 + -1bX) + a(X + -1b))
Y = 3(X2 + -1bX + (X * a + -1b * a))
Y = 3(X2 + -1bX + (aX + -1ab))

Reorder the terms:
Y = 3(X2 + aX + -1ab + -1bX)
Y = 3(X2 + aX + -1ab + -1bX)
Y = (X2 * 3 + aX * 3 + -1ab * 3 + -1bX * 3)
Y = (3X2 + 3aX + -3ab + -3bX)

Solving
Y = 3X2 + 3aX + -3ab + -3bX

Solving for variable 'Y'.

Move all terms containing Y to the left, all other terms to the right.

Simplifying
Y = 3X2 + 3aX + -3ab + -3bX