Please Help! please describe in detail one efficient way to solve this problem and what makes this method efficient. also, describe in detail one inefficient way to solve this problem and what makes this method inefficient

7.5

Step-by-step explanation:

One efficient way is to first divide both sides by 4. This way, you can have the root on one side and a whole number on the other side. So now you have = 4. To get rid of the root, you can square both sides and get 2x - 1 = . Now you can solve this like any other equation and get x = 7.5. This method is efficient because it makes the next step very obvious, so it's not confusing.

One inefficient way to solve this problem is to first take 16 to the left to set the equation, then square both sides. This would leave you with - = 0. This equation is super confusing because there seems to be so many things you could do next, but it's hard to tell which one would be the right thing to do.

the answer is B

(3x²+2x-5)-(5x²-4x+1)

= 3x²+2x-5-5x²+4x-1

= 3x²-5x²+2x+4x-5-1

= -2x²+6x-6