Question

if the sum of the square of the number and 4 time the number is 21, what is the number?​

Answer 1

Answer:

Step-by-step explanation:Let the no be x then square is = x Square  or you can write like a symoblic = x power 2

then x Square + 4 =21

x Square =21+4 =x Square =25

x = Square root of 25 =5

Ans = 5