Question

tim x

219-7(x+1)=100                                              (3x-6).3=3^4

Answer 1

219 - 7(x+1) = 100

7(x+1) = 119

x + 1 = 17

x = 16

(3x - 6).3 = 3⁴

3x - 6 = 3³

3x = 33

x = 11

Answer 2

a) 219 - 7(x + 1) = 100

=> 219 - 7x - 7 = 100

=> -7x = 100 - 219 + 7

=> -7x = -112

=> x = -112 ; (-7) = 16

b) (3x - 6) . 3 = 3⁴

=> 9x - 18 = 3⁴

=> 9x = 3⁴ + 18

=> 9x = 99

=> x = 99 : 9 = 11