If f(x) = -x2 + 6x, what is f(-3)?

Simplify the expression. enter the correct answer.

Anyone know? will mark brainliest if correct!

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)-144x+360 what am i doing wrong?