Question

Can someone please help

Answer 1

1.11

2.4

3.5

pls correct me if I'm wrong

Answer 2

38. (b) 11

39. (c) 4

40. (c) 5

Explanation:

38.)

`\implies \: \sf √(3xx - 8) = 5 \\ \\ \implies \: \sf 3xx - 8 = {(5)}^(2) \\ \\ \implies \: \sf 3xx - 8 = 25 \\ \\ \implies \: \sf 3xx = 25 + 8 \\ \\ \implies \: \sf 3xx = 33 \\ \\ \implies \: \sf xx = (33)/(3) \\ \\ \implies \: \sf xx = 11\\`

Hence, Required answer is option (b) 11.

39.)

`\implies \: \sf √(4xx -7 ) - 3 = 0 \\ \\ \implies \: \sf √(4xx - 7) = 3 \\ \\ \implies \: \sf 4xx - 7 = {(3)}^(2) \\ \\ \implies \: \sf 4xx - 7 = 9 \\ \\ \implies \: \sf 4xx = 9 + 7 \\ \\ \implies \: \sf 4xx = 16 \\ \\ \implies \: \sf xx = (16)/(4) \\ \\ \implies \: \sf xx = 4 \\`

Hence, Required answer is option (c) 4.

40.)

`\implies \: \sf √(6xx + 6) - 6 = 0 \\ \\ \implies \: \sf √(6xx + 6) = 6 \\ \\ \implies \: \sf 6xx + 6 = {(6)}^(2) \\ \\ \implies \: \sf 6xx + 6 = 36 \\ \\ \implies \: \sf 6xx = 36 - 6 \\ \\ \implies \: \sf 6xx = 30 \\ \\ \implies \: \sf xx = (30)/(6) \\ \\ \implies \: \sf xx = 5 \\`

Hence, Required answer is option (c) 5.