CREATE TABLE table_33917 ("Year" FLOAT, "Championship" TEXT, "Winning score" TEXT, "Margin" TEXT, "Runner ( s ) -up" TEXT)

What is the Margin when the Winning score is +8 (70-69-70-75=284)?
SELECT "Margin" FROM table_33917 WHERE "Winning score" = '+8 (70-69-70-75=284)'
SELECT "Margin" FROM "table_33917" WHERE "Winning score" = '+8 (70-69-70-75=284)'