Question

5. A triangle has side lengths 3x2 + 5x –1, 6x2 + 5, -7x +1.

Which of the following expressions represents the perimeter of the triangle?
A. 9x2 + 2x + 5
B. 9x2 – 2x + 5
c. 9x2 + 2x + 4-1
D. 9x2 – 5x + 7x + 5

Answer 1

option B. 9x² – 2x + 5x

Step by step explanation:

The perimeter of a triangle is the sum of all its three sides.

3x²+5x–1+6x²+5–7x+1

= 9x²–2x+5