Question

Show that

(4a+5)² - 80a = (4a – 5)²
​

Answer 1

solution

16a² + 40a + 25 - 80a = ( 4a - 5 ) ²

16a ² - 40a + 25 = ( 4a - 5 ) ²

16a² - 40a + 25 = 16a ² - 40 + 25

16a² - 40a + 25 - 16a² = - 40a

- 40a + 25 = - 40a + 25

- 40a + 25 + 40a = 25

25 = 25