tailieunhanh - SAT II Math Episode 1 Part 7

Tham khảo tài liệu 'sat ii math episode 1 part 7', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Math Practice Exercises and Solutions by Topic 115 2. The correct answer is A . logjX 1 c b1 c x 3. The correct answer is D . log 2xy log 2 log x log y 4. The correct answer is C . From the graph 20 1 21 2 22 4 and 23 8 where y is the exponent and x is the power of 2. Thus 2y x or y log2x 5. The correct answer is 4 and 5 . Let log3 92 x then 3x 92. Since 34 81 and 35 243 x is between 4 and 5 6. The correct answer is D . P K10-xt log p log xt log 10 logP logẪT-xí xt log T-logP _ logẪT-logP t 7. The correct answer is B . If logr 6 S logr 3 T then logr logr l s -T log jj logz -logr2 l- 5-T 1-S T 7. EQUATIONS QUADRATIC AND RADICAL 1. The correct answer is 9 . x2 6x c 0 b2-4ac 36-4c 0 4c 36 c 9 2. The correct answer is 3 . X 1 - 2 0 X 1 2 x l 4 X 3 ARCO SAT II Math arco 116 Part IV 3. The correct answer is 2x2 - 7x 3 0 2x-l x-3 0 2x -1 0 X - 3 0 1 x 3 x 2 4. The correct answer is 4 . X2-3x-k 0 -l 2-3 -l -fc 0 1 3-jt 0 k 4 5. The correct answer is 3 . x-2 4 sjx-2 4-x x-2 16-8x x2 X2 -9x 18 0 x - 3 x - 6 0 x-3 0 X 3 x-6 0 X 6 x Check both values in original equation. x Vx-2 4 3 a 3--2 4 3 1 4 checks X yJx-2 4 6 a 6--2 4 6 2 4 does not check x 3 is the only root arco ARCO SAT II Math Math Practice Exercises and Solutions by Topic 117 6. The correct answer is 0 . x2 ý2 4 graphs as a circle of radius 2 with center at the origin. y 4 graphs as a horizontal line 4 units above the x-axis. There are no intersections. 7. The correct answer is Pin I 8 I -8 J 3r2- rs 3 r 6r - 5 10 or 5 6r -10 Substitute this value of s in original equation. 3r2 r 6r-10 3 3r2-6r2 10r-3 0 -3r2 10r-3 0 3r2-10r 3 0 3r-l r-3 0 3r-l 0 1 r 3 5 6r-10 r-3 0 r 3 5 6r-10 5 6 3 -10 5 8 r ị 5 -8 and r 3 5 8 3 8. The correct answer is 252 1-52 52 r 2 r s2t 2s2 t Is2 t-s2t 252 t l-52 ARCO SAT II Math .