Question

5n² - 1 = 1980
how it is solve ​

Answer 1

Step-by-step explanation:

5n^2=1980+1

5n^2=1981

n^2=1981/5

n^2=396.2

n=√396.2

Answer 2

Answer:

n= √(1981/5)

Step-by-step explanation:

5n²-1 = 1980

5n² = 1980+1

5n²= 1981

n²= 1981÷5 = 1981 / 5

n= √(1981÷5) ------> this ans is valid

but If u want to be accurate....

n= √396.2

n= 19.904

n= approx. 20

Thank you