Determine which of the following methods is the best choice for solving the given equation: factoring, using the principle of square roots or using the quadratic formula. Then, solve the equation.x2 - 9 = 0
A. Quadratic formula; -3 + i
B. Square root principle or factoring; ±3
C. Square root principle or factoring; 3
D. Factoring; 0, 3
Answer: B
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Find all values that make the rational expression undefined. If the rational expression is defined for all real numbers, so state.
A. a = 8, a = 4 B. a = 8 C. a = -8 D. Defined for all real numbers
Solve the equation. Use a calculator where appropriate. If the answer is irrational, round to the nearest hundredth.log2 (20 - 4x) = 3
A. 
B. - 
C. -3
D. 3
Find the present value. Round to the nearest cent.
A. $4182.06 B. $19,802.32 C. $1931.84 D. $1817.94
Identify the polynomial as a monomial, binomial, trinomial, or none of these. Give its degree.11z4 + 1z3 - 3z2 + 9
A. Binomial, degree 10 B. Trinomial, degree 4 C. None, degree 4 D. Trinomial, degree 9