exam Maths Puzzle Numerical Ability

Find the Domain of the function:

(x^4 - 2x^2 +7)/ (3x^2 -10x -8)

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exam Other Question

For what value of k does the equality hold

|1 0 4 | |1 0 4|
|3 0 9 |=k|3 0 9|?
|5 5 20| |5 5 20|

a. -1
b. 0
c. 1
d. 2 what is the branch of mathenatics that relates to real life situations?