Use the formula a2 – b2 = (a + b)(a – b) to factor completely.

What are the factors of 36x8 – 49?

(9x4 – 1)(4x2 + 49)
(36x4 – 7)(x2 + 7)
(6x4 – 7)(6x4 + 7)
(6x8 – 7)(6x + 7)

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form:    science fiction books to history books 2. write the ratios as fractions:    dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.

The trigonometric ratios sine and secant are reciprocals of each other