Question

a, x + 3x = 360          b, 41 - (2x - 5) = 18          c, 2^x . 4 = 128

Answer 1

a, \(\Leftrightarrow4x=360\\ \Leftrightarrow x=90\)

b, \(\Leftrightarrow2x-5=23\\ \Leftrightarrow2x=28\\ \Leftrightarrow x=14\)

c, \(\Leftrightarrow2^{x+2}=2^7\\ \Leftrightarrow x+2=7\\ \Leftrightarrow x=5\)

Answer 2

a: x=90

c: x=5

Answer 3

a. x + 3x = 360

<=> 4x = 360

<=> x = 90

b. 41 - (2x - 5) = 18

<=> 41 - 2x + 5 = 18

<=> 2x = -(18 - 5 - 41)

<=> 2x = 28

<=> x = 14

c. 2^x . 4 = 128

<=> 2^{x + 2} = 2⁷

<=> x + 2 = 7

<=> x = 5