Hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
Answer:
-40
-32.7
-32.5
-15
113.2
115
Step-by-step explanation:
(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)
5n - 10 is the way to write the expression you wrote in English above.
It does not mean much until we set it equal to something.
For example:
The difference of five times a number n and 10 is 25.
Now
5n - 10 = 25
by subtracting 10 from each side we get 5n=35 and then if we divide both sides by 5, we get n=7.
Answer:
b
Step-by-step explanation: