Plz help will mark brainliest

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

5. (03.02)if g(x) = x2 + 3, find g(4). (2 points)1619811

Use mathematical induction to prove the statement is true for all positive integers n, or show why it is false. 1^2 + 4^2 + 7^2 + + (3n - 2)^2 = [n(6n^2-3n-1)/2]