Question

If x = 3 calculate the value of x2+x

Answer 1

The X just represents what the value will be in the equation, in this case 3, and when you have the letter besides a number, you just multiply them together:
x2+x = (2*3)+3 = 9

The answer is 9,
Hope this helps! :)

Answer 2

If x = 3 calculate the value of x^2+x
3^2 +3
= 9 + 3
= 12