X^2-6x+9 as the square of a binomial

Ineed i been stuck on this question since yesterday

Raj encoded a secret phrase using matrix multiplication. using a = 1, b = 2, c = 3, and so on, he multiplied the clear text code for each letter by the matrix to get a matrix that represents the encoded text. the matrix representing the encoded text is . what is the secret phrase? determine the location of spaces after you decode the text. yummy is the corn the tomato is red the corn is yummy red is the tomato

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16