The diagram shows the first four patterns of a sequence. Find an expression for the numbers of squares in the nth pattern of the sequence.

n^2+3

Step-by-step explanation:

As we can see in the diagram

1st pattern consists from 1 square 1x1 +3 squares 1x1 each

2nd pattern consists from 1 square 2x2 +3 squares 1x1 each

3-rd pattern consists from 1 square 3x3 +3 squares 1x1 each

4-th pattern consists from 1 square 4x4 + 3 squares 1x1  each

We can to continue :

5-th pattern consists from 1 square 5x5+3 squares 1x1 each

So the nth    pattern consists from 1 square nxn+3 squares 1x1 each

Or total amount of 1x1 squares in nth pattern N= n^2+3

n² + 3

Step-by-step explanation:

The first pattern has 4 squares.

The second pattern has 7 squares.

The third pattern has 12 squares.

The fourth pattern has 19 squares.

When we subtract 3 on each term we get:

1, 4, 9, and 16, which are perfect squares.

So n² is in the formula. Each term is added 3 to the perfect squares.

The nth term becomes n² + 3.

a

step-by-step explanation: