Final answer:
To find the integer, we solve the equation x^2 + 18 = 432 by subtracting 18 from both sides and taking the square root.
Step-by-step explanation:
To solve this problem, let's assume the integer is x.
According to the given information, we can write the equation:
x^2 + 18 = 432
Subtracting 18 from both sides, we get:
x^2 = 414
Taking the square root of both sides, we have:
x = √414
We find that the square root of 414 is approximately 20.36. Since we are looking for an integer, we can conclude that the correct answer is 20. Therefore, none of the provided choices (A, B, C, D) is correct.