What is one tenth of this expanded number

Which shows one way to determine the factors of  x3  +  5x2  –  6x  –  30 by grouping? x(x2  –  5)  +  6(x2  –  5)x(x2  +  5)  –  6(x2  +  5)x2(x  –  5)  +  6(x  –  5)x2(x  +  5)  –  6(x  +  5)

Solve: 3x+y=6 4x-2y=18 show all work !

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?