Question

2x^2-1=49

Answer 1

2x² - 1 = 49

2x² - 1 = 7²

2x - 1 = 7

2x      = 7 + 1

2x       = 8

  x       = 8 : 2

  x       = 4

Answer 2

2x²-1=49

2x²=49+1

2x²=50

2x²=2.25

2x²=2.5²

x=5

Answer 3

2x² - 1 = 49

=> 2x² = 49 + 1

=> 2x² = 50

=> 2x² = 2 . 5²

=> x² = 5²

=> x = 5