Answer:
15t/4 + 4u
Step-by-step explanation:
can i have a brainlest plz
 
        
             
        
        
        
Hello from MrBillDoesMath!
Answer:
Solutions: x = +\- 5i or x = +\- sqrt(5) 
Discussion:
Factor x^4 - 25:
x^4 - 25     = (x^2+5) (x^2-5)                              =>  factor x^2 - 5
x^4 - 25 =   (x^2+5)(x + sqrt(5)) (x - sqrt(5))       => factor x^2 + 5
x^4 = 25  = (x +5i)(x-5i) (x + sqrt(5)) (x - sqrt(5))   
Hence the solutions are
x = +\- 5i and x = +\- sqrt(5) 
Thank you,
MrB