I need help figuring out how to find the sides lengths

I need help figuring out how to find the sides lengths

Adding Polynomials

I'm having trouble trying to solve this problem. I know about special products but I don't know how to solve this. Please, help.

You are designing a rectangular rubber stamp. The length of the stamp is 2r+3. The width of the stamp is r-4.

Select the product of (7x - 4)(2x + 8). I have the answer of 14x^2+48x-32 is this correct?

Simone used a CAS to multiply 2n-5 by n^2+3n+6 to get 2*n^3+n^2-3*n-30 explain which multiplications were done and combined to get each term in the product

i dont know how to multiply polynomial and show work (9x+5)(3x-6)

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