Can someone with the first question

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

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.