Question

[Nghiêm Thị Lan Hương]

7) -4(x + 41) = 400 8) 2x – 49 = 5 . 32

Answer 1

[ng.nkat ank]

7) -4(x +41) = 400

x + 41 = 400 : -4 = -100

x = -100 - 41 = 141

8) 2x - 49 = 5 . 3² = 5 . 9

2x =  9 + 49 = 58

x = 58 : 2 = 29

Answer 2

[Nguyễn Minh Anh]

7) \(-4x-246=400\Leftrightarrow-4x=646\Leftrightarrow x=-161,5\)

8) \(2x-49=45\Leftrightarrow2x=94\Leftrightarrow x=47\)