Question

131 = 2 × _________ + 1 = (66)² - (____)²​

Answer 1

Answer:

65

Step-by-step explanation:

first dash :

2 × x + 1 = 131

2 × x = 130

x = 65

second dash :

${66}^{2} - {x}^{2} = 131$

There is a formula as:

${x}^{2} - {y}^{2} = x + y$

with this formula we get:

${66}^{2} - {x}^{2} = 131$

$66 + x = 131$

$x = 131 - 66$

$x = 65$

solved