What are the solutions of the equation: x2 – 1 = 15? x = ± sqrt 14
x = ± sqrt 15
x = ±4
x = ±8

x = ± 4

Step-by-step explanation:

Given

x² - 1 = 15 ( add 1 to both sides )

x² = 16 ( take the square root of both sides )

x = ± = ± 4

$25

step-by-step explanation:

25 - 4.50 = 20.5

20.5 / 2 = 10.25

10.25 + 10 = 20.25

20.25 - 12.50 = 7.75

therefore the answer is $25 as shown as the first number.