Maths problem, help please!?
Could you please explain to me how to factorise this:
x^4 + 7x^2 + 8
Any help is greatly appreciated! 10 Points for best answer!
Could you please explain to me how to factorise this:
x^4 + 7x^2 + 8
Any help is greatly appreciated! 10 Points for best answer!
Comments
First find the square root of the x^4. The answer is x^2
Then find two factors of 8 which when we add is equal to 7.
The factors of 8 are 1 and 8 and 4 and 2.
1 + 8 = 9 which is not equal to 7
4 + 2 = 6 which is not equal to 6
So x^4 + 7x^2 + 8 can't be factored out.
what does x equal and i'll be able to answer it... But if you know what "X" ='s then this is what you should try:
lets say x = 3
The this is what you do
x^4 (3^4) which is 3*3*3= 27
and then 7x simply means 7x3= 21 and then it says ^2 which is squared and that would be 21^2= 441
So we have 27+441+8
WHICH EQUALS
476
Hope I did this write. I am only in 7th grade Alegebra. May have done it wrong. Haha. Sorry. BEST OF LUCK
*~*~*~*DuCeS
(x^2+8)(x^2-1)
well, x^4=(x^2*x^2) because when multiplying exponets you just add
so, you know it's (x^2+something)(x^2+something else)