PLEASE HELP! ( no random links. )

Which expression is the factorization of x^2+10+21

Binh says the point of intersections is (0,-3) which statements identify the errors binh made , check all that apply

Which statement is true about the local minimum of the graphed function? over the interval[-4,-2], the local minimum is 0. over the interval [-2,-1] , the local minimum is 25. over the interval [-1,4], the local minimum is 0. over the interval [4,7], the local minimum is -7