Fill in the blanks to make each statement true.

x²(___+4x-3)=___×3x²+x²×___-x²×___
___(x²-3x+__)=5x×___+____×(-3x)-___×5
___(2x³+___+3x-___)=-6x⁴-15x³-___+6x
2x²(___+___-___)=2x⁴-10x³-16x²