30 increased by 3 times the square of a number
The phrase a number means an arbitrary variable, let's call it x
x
The square of a number means we raise x to the power of 2:
x^2
3 times the square:
3x^2
The phrase increased by means we add 3x^2 to 30:
30 + 3x^2
The phrase a number means an arbitrary variable, let's call it x
x
The square of a number means we raise x to the power of 2:
x^2
3 times the square:
3x^2
The phrase increased by means we add 3x^2 to 30:
30 + 3x^2