Question

a)2x-138=2³.3²

b)10+2x=4³.4²

c)(3x-2⁴).7³=2.7⁴

d)x⁴=16

e)5^x+12=625

f)(x⁴)¹¹= x

NHANH LÊN NHA MK CẦN GẤP LẮM LUÔN ĐẤY

Answer 1

2x - 138 = 2³ . 3²

=> 2x - 138 = 72

=> 2x = 72 + 138

=> 2x = 210

=> x = 105

10 + 2x = 4³ . 4²

10 + 2x =1024

2x = 1024 - 10

2x = 1014

x = 507

Answer 2

(3x - 2⁴) . 7³ = 2.7⁴

3x - 2⁴ = 2 . 7⁴ : 7³

3x - 16 = 14

3x = 14 + 16

3x = 30

x = 10

x⁴ = 16

=> x⁴ = 2⁴

=> x = 2

Answer 3

5^{x + 12} = 625

5^{x + 12} = 5⁴

=> x + 12 = 4

=> x = 4 - 12

=> x = -8

(x⁴)¹¹ = x

x⁴⁴ = x

=> x = 1; 0