How to solve this math problem (algebra)?
x^4 + x^2 - 6 =0
x^4 + x^2 - 6 =0
sparky
Favorite Answer
there are a lot of ways...
one is to factor:
(x² + 3)(x² - 2) = 0 <-- kind of like backwards FOIL
then
x² + 3 = 0 or x² - 2 = 0 <-- since if parentheses are multiplied and equal 0 then one set must be 0 for that to happen
x² + 3 can't be 0 since x² must be 0 or bigger (unless you have talked about "complex" numbers in your class.
so x² - 2 = 0.
this will happen when x² = 2
so x = either √2 or -√2
good luck
Erika
(3x-5)/4 +x/2 = a million/3 {(3x-5)*2 + (x*4)}/8 = a million/3 (6x-10+4x)/8 = a million/3 10x - 10 = 8/3 10x= (8/3)+10 10x= 38/3 x= 38/30 x= 19/15 or a million.26 * refers to multiplication / refers to branch