 help with some math questions? - XP Math - Forums Sign Up FREE! | Sign In | Classroom Setup | Common Core Alignment  XP Math - Forums help with some math questions? 08-07-2007 #1 mike r Guest   Posts: n/a help with some math questions? 1. list all possible zeros of the following question:2x^4 - 3x^2 + -4=02. write as a sum of difference of logs of x,y, and zlog(x^5z^3/y^7)3. find the sum of the first 500 terms50,25,12.5,6.25,....4. left f(x)= 1/(x+5) and g(x) = (x +3)^1/2 find the domain of f+g,f-g,fg, and g/f  08-07-2007 #2 Tony The Dad Guest   Posts: n/a #1) 2x^4 - 3x^2 + -4=02(xÂ²)Â² - 3xÂ² -4 = 0Substitute x^2 with q:2qÂ² - 3q - 4 = 0Use quadratic formula (using q instead of x)q = (-(-3)Â±âˆš((-3)Â²-4Â·2Â·(-4)))/(2Â·2) = (3 Â±âˆš(9+32))/4 = (3 Â±âˆš(41))/4Substitute xÂ² for q:xÂ² = (3 Â±âˆš(41))/4x = Â±âˆš((3 Â±âˆš(41))/4)You'll get 2 imaginary answers and 2 real answers. Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
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