Question

If x=3, calculate the value of: X squared + 2x

Answer 1

$x^2+2x\\\\\text{If x = 3,}\\\\3^2 + 2(3) = 9 + 6 = 15$

Answer 2

Answer:

As we are told that the value of x is equal to 3, we are able to substitute this into our equation, so it becomes 2(3)^2. We then use the rules of BIDMAS, so we must square the number 3 first (meaning we multiply the number by itself), and then multiply it by two. 3^2 is 9, and 9 times 2 = 18. Therefore, the answer is 18.