已知抛物线y^2=-x与直线y=k(x+1)相交与A,B两点(1)求证:OA⊥OB (2)当△OAB的面积等于√10时,求k的值有谁能用向量法解决这题,请帮帮我,谢谢
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![已知抛物线y^2=-x与直线y=k(x+1)相交与A,B两点(1)求证:OA⊥OB (2)当△OAB的面积等于√10时,求k的值有谁能用向量法解决这题,请帮帮我,谢谢](/uploads/image/z/12555505-1-5.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%5E2%3D-x%E4%B8%8E%E7%9B%B4%E7%BA%BFy%3Dk%EF%BC%88x%2B1%EF%BC%89%E7%9B%B8%E4%BA%A4%E4%B8%8EA%2CB%E4%B8%A4%E7%82%B9%281%29%E6%B1%82%E8%AF%81%EF%BC%9AOA%E2%8A%A5OB+%EF%BC%882%29%E5%BD%93%E2%96%B3OAB%E7%9A%84%E9%9D%A2%E7%A7%AF%E7%AD%89%E4%BA%8E%E2%88%9A10%E6%97%B6%2C%E6%B1%82k%E7%9A%84%E5%80%BC%E6%9C%89%E8%B0%81%E8%83%BD%E7%94%A8%E5%90%91%E9%87%8F%E6%B3%95%E8%A7%A3%E5%86%B3%E8%BF%99%E9%A2%98%2C%E8%AF%B7%E5%B8%AE%E5%B8%AE%E6%88%91%2C%E8%B0%A2%E8%B0%A2)
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