... + 12 cm = 60 cm.9. 4Substitute 2 for xand 5 for y:(3xy+ x)ᎏxyᎏ=((3) (2) (5) + 2) ᎏ 2 5ᎏ= (30 + 2) ᎏ 2 5ᎏ= 32 ᎏ 2 5ᎏ= (͙5 32 ෆ) 2 = 2 2= 4. Or, 3 (2) (5) = 30, 30 + 2 = 32, ... (x – 5) 2 – 4b. y = (x + 5) 2 – 4c. y = (x – 5) 2 + 4d. y = (x + 5) 2 + 4e. y = x 2 – 29 4. If b3= –64, then b 2 – 3b – 4 =a. –6.b. –4.c. 0.d. 24 .e. 28 .– PRACTICE TEST 3– 22 55.The ... equationto find the value of a:–6b + 2a – 25 = 5,–6(–3) + 2a – 25 = 5, 18 + 2a = 30, 2a = 12, a = 6. Finally, (ᎏabᎏ) 2 = (ᎏ–63ᎏ) 2 = (–ᎏ1 2 ᎏ) 2 = ᎏ14ᎏ.13. 6 If j@k = –8 when...