Question

  a) 28 + 2x = 35 – (- 13) ;                   b) - 25 – (x + 5) = 415 + 5(x – 83)

  c) 2 (x + 1)² = - 7 + 15 ;                      f) (x – 4)² – 48 = - 12 ;   

  g) (x + 3)³:3 – 1 = - 10  ;                    h) (3x + 9)(11 – x) = 0.

Answer 1

mình cần gấp

 

Answer 2

a, 28 + 2x = 35 - ( -13 )

=> 2x = 35 + 13 - 28

=>2x = 20

=> x = 10. vậy x = 10

Answer 3

a, \(28+2x=35+13\Leftrightarrow28+2x=48\Leftrightarrow2x=20\Leftrightarrow x=10\)

b, \(-25-x-5=415+5x-415\Leftrightarrow-6x=30\Leftrightarrow x=-5\)

Answer 4

c: \(\Leftrightarrow\left(x+1\right)^2=4\)

\(\Leftrightarrow\left[{}\begin{matrix}x+1=2\\x+1=-2\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-3\end{matrix}\right.\)