function hypot( x, y ) {
	x = abs( x );
	y = abs( y );
	if ( x > y ) {
		return (ALPHA*x) + (BETA*y);
	}
	return (ALPHA*y) + (BETA*x);
}
Computes the hypotenuse using the alpha max plus beta min algorithm.

@param {number} x - number
@param {number} y - number
@returns {number} hypotenuse

@example
var h = hypot( -5.0, 12.0 );
// returns ~13.5