One side of the triangle is equal to a, the second is -3, and the third is twice the first. find the perimeter

One side of the triangle is equal to a, the second is -3, and the third is twice the first. find the perimeter of a triangle (1) P = 2 (a + 3) (2) p = 2a + 3 (3) p = 3 (a + 3) (4) p = 3 (a + 1)

Before we find the perimeter of a triangle, let’s remember the rule according to which the perimeter of a figure is the sum of all its sides.
In order to find out the perimeter of a triangle, we first write down the corresponding formula.
P = a + b + c, where P is the perimeter and a, b and c are the sides of the triangle.
Since, by condition, one side of the triangle is equal to a, the second is 3, and the third is twice as large as the first, we can write the following equality.
P = a + 3 + 2a.
Now we will give similar ones.
P = a + 2a + 3 = 3a + 3.
Let’s take out 3.
P = 3 (a + 1). Thus, the correct answer is number 4.