Are these correct?

a1=(-3x1)2 +4=13
a2=(-3x2)2+4-40
a3=(-3x3)2+4=85
a4=(-3x4)2+4=148
a5=(-3x4)2+4=229
a6=(-3x4)2+4=328

The first six terms of the sequence are 13, 40, 85, 148, 229, 328

I keep coming up with these answers but there is suppose to be an error somewhere.

As you wrote it before,

-3x^2+4 = -3(x^2) + 4

You have tabulated (-3x)^2 + 4, which is very different

To verify if the given sequence of numbers is correct, we can evaluate each term using the provided expressions. Let's go through the calculations together:

a1 = (-3 × 1)^2 + 4 = 9 + 4 = 13 - Correct

a2 = (-3 × 2)^2 + 4 - 40 = 36 + 4 - 40 = 40 - Incorrect

a3 = (-3 × 3)^2 + 4 = 81 + 4 = 85 - Correct

a4 = (-3 × 4)^2 + 4 = 144 + 4 = 148 - Correct

a5 = (-3 × 4)^2 + 4 = 144 + 4 = 148 - Incorrect

a6 = (-3 × 4)^2 + 4 = 144 + 4 = 148 - Incorrect

Based on the corrected calculations, we can conclude that the first six terms of the sequence should be 13, 40, 85, 148, 148, 148. It seems there are repeated values after the third term (148 is repeated), suggesting an error in the calculations for a5, a6, and possibly a2.

Please double-check your calculations for a2, a5, and a6 to find where the error occurred.