function both( term, convergent, negative ) {
	return ( negative && term > 0 ) ? [ -term, -convergent ] : [ term, convergent ]; // eslint-disable-line max-len
}
Returns a result as two-element array consisting of a continued fraction term and its associated convergent.

@private
@param {number} term - continued fraction term
@param {number} convergent - continued fraction convergent
@param {boolean} negative - boolean indicating whether the input value is negative
@returns {Array<number>} result