The area of a rectangular window is (6x2 + 5x – 4)cm². The width of the window is (2x - 1)cm. (a) Find the height of the window in terms of x.
(b) If x = 40, find the perimeter of the window.

Step-by-step explanation:

a)

W =              3x + 4    

2x - 1 | 6x² + 5x - 4

   -      6x² -  3x

                    8x - 4

           -        8x - 4

                            0  

b) P = 2((2x - 1) + (3x + 4))

   P = 2(5x + 3)

   P = 10x + 6

   P = 10(40) + 6

   P = 406 cm

f(x) = x^3 -2x^2 -3x

x( x^2 -2x-3)

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

x( x(x+1) -3(x+1))

x( x-3)( x+1)

so zeroes are 0, 3,-1

its (2) option

you can't solve x because it is 2 linear equation and you only have one equation