7 . 3
--- × ------
10. . 6
= 21
--------
60
= 7/20
Answer:
I III and IV
Step-by-step explanation:
You can do that using +6 and -6 .
(6) · (-6) = - 36
(6) + (-6) = 0
Answer:
(x+1)(x-1)(x+3)(x-3)
Step-by-step explanation:
x4-10x^2+9
Group expression so that the coefficients of the x^2 terms add up to +9.
= x^4 -9x^2 - x^2+9
match coefficients in both groups
= x^4 -9x^2 - (x^2-9)
factor each group
= x^2 (x^2-9) - 1(x^2-9)
now factor out the common factor (x^2-9)
= (x^2-1)(x^2-9)
Finally, factor each quadratic factor
= (x+1)(x-1)(x+3)(x-3)
