What is the value of x if length is 3x-1 and width is x and the perimeter is 84

x = 10.75

Step-by-step explanation:

To find the value of x, we need to know the equation for the perimeter of a rectangle.  This equation is:

P = 2L + 2W

Where P is the perimeter, L is the length, and W is the width.

We are given P = 84, L = 3x -1 , and W = x.  Now we just plug these values in and solve for x.

P = 2L + 2W

84 = 2 ( 3x - 1 ) + 2 ( x )

84 = 6x - 2 + 2x

84 = 8x - 2

86 = 8x

86 / 8 = x

43 / 4 = x

(40 + 3) / 4 = x

10.75 = x

Hence, the value of x = 10.75.

Cheers.

the discriminant is 64 + 4*1*12 = 112

this is prime.

step-by-step explanation: