SAN FRANCISCO — SoftBank formally started out its method for getting a significant stake in Uber with a proposal to buy some shares at a valuation of $48 billion, significantly down below the practically $70 billion valuation the ride-hail…

SAN FRANCISCO — SoftBank formally started its approach for buying a big stake in Uber with a proposal to acquire some shares in a valuation of $48 billion, significantly down below the just about $70 billion valuation the experience-hailin…