Question

Solve the quadratic by taking square roots Round to the nearest tenth. 2x² - 9 = 121

Answer 1

Answer:

  x ≈ ±8.1

Step-by-step explanation:

  2x² -9 = 121 . . . . given

  2x² = 130 . . . . . . add 9

  x² = 65 . . . . . . . .divide by 2

  x = ±√65 . . . . . take the square root

  x ≈ ±8.1