12x + 5 - 4x + 2x² =
= 2x² + 12x - 4x + 5 = <u>2x²</u><u> </u><u>+</u><u> </u><u>8x</u><u> </u><u>+</u><u> </u><u>5</u>
Company a = 22 + 0.07m
company b = 8 + 0.12m
We are looking for the time when the prices are equal. i.e. the price of company a = the price of company b
company a = company b
22 + 0.07m = 8 + 0.12m
22 - 8 = 0.12m - 0.07m
14 = 0.05m
m = 14/0.05
m = 280
Therefore, the two companies will cost the same if you talk for 280 minutes
This is different than the usual questions we get.
We're given a set of some multiples of 36:

We're asked how many of those are perfect squares.
36 is of course already a perfect square, so for the product to be a perfect square the other factor must be as well. So this is equivalent to:
How many perfect squares are there between 2 and 35?
Just listing them, there's 
Answer: 4 squares
The value of X in this equation would be -1.