Is it true or false that the middle term of a perfect square trinomial is equal to 2 × √(first term) × √(last term)?

S-7< 3 i need answering this problem someone asap answer

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]

Simply 8x squared + 5(7x squared- x) - 2x =