tag:blogger.com,1999:blog-8201820178269982451.post6807586276958113672..comments2020-04-05T02:53:44.430-07:00Comments on Perfect Scorer Test Prep: SAT Practice TestsUnknownnoreply@blogger.comBlogger4125tag:blogger.com,1999:blog-8201820178269982451.post-11898695362389848912018-08-29T03:33:19.697-07:002018-08-29T03:33:19.697-07:00This comment has been removed by a blog administrator.railwayrecruitmenthttps://www.blogger.com/profile/14460648524744254385noreply@blogger.comtag:blogger.com,1999:blog-8201820178269982451.post-41157249271245325952018-08-28T05:31:37.978-07:002018-08-28T05:31:37.978-07:00This comment has been removed by a blog administrator.Anonymoushttps://www.blogger.com/profile/03930729451067952019noreply@blogger.comtag:blogger.com,1999:blog-8201820178269982451.post-43320362052246472772017-12-27T21:42:25.140-08:002017-12-27T21:42:25.140-08:00That's a great question! You mean question 7 i...That's a great question! You mean question 7 in the no-calculator section, right?<br /><br />If you plug both -1 and 5 back into the original equation, you'll find that -1 doesn't work (giving us 2 + 4 = -1 + 3), but 5 does (giving us 4 + 4 = 5 + 3).<br /><br />The square root of 4 isn't allowed to be a negative number, unfortunately. The technical reason for this is that if we allowed the square root of 4 to be both 2 and -2, then y = x^1/2 wouldn't pass the vertical line test and therefore wouldn't be a function.<br /><br />Please let me know if I can clarify this explanation any further. Thanks again for commenting!Adminhttps://www.blogger.com/profile/11539359728241953256noreply@blogger.comtag:blogger.com,1999:blog-8201820178269982451.post-89955509332102662372017-12-27T21:31:46.307-08:002017-12-27T21:31:46.307-08:00i disagree with the answer to question 7 in practi...i disagree with the answer to question 7 in practice test 8. The square root of 4 could be -2. therefore answer should be C not B, am I missing something?Anonymousnoreply@blogger.com