Question

Which of the following are solutions to the equation below (5x+1)^2=7? Check all that apply.

Answer 1

Answer:C E (apex) !!

Step-by-step explanation:

Answer 2

(5x+1)² = 7; expand: 25x² + 10x +1 = 7 or 25x² + 10x -6 = 0

Solve this quadratic for x:

x = [-b + √(b² - 4ac)]/2a and x = [-b - √(b² - 4ac)]/2a
Plug the values and you'll find :
x = (- √7 - 1)/5 (answer C)
x = (+√7 -1)/5  (answer E)