Please help me I can’t do this

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

To diagonalize an nxn matrix a means to find an invertible matrix p and a diagonal matrix d such that a pdp d p ap or [1 3 dh epap 3 let a=-3 -5 -3 3 3 1 step 1: find the eigenvalues of matrix a "2's" step 2: find the corresponding eigenvectors of a step 3: createp from eigenvectors in step 2 step 4 create d with matching eigenvalues.