How much is 2a + b greater than a - 2b​

Given f(x) = 2x^2- 5x+1, determine the function value f(2). do not f(x) = in your answer

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Hello people, i have a math question that i need with, me, i will give the correct one brainiest, and for the other correct people, a and 5 stars.