What is the vertex of the graph
y = - 2x² + 8x +9 ?

(2, 17)

Step-by-step explanation:

observe

y = –2x² + 8x – 8 + 17

y = –2(x² – 4x + 4) + 17

y = –2(x–2)² + 17

so, the vertex is (2, 17)

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

50x5=$250

step-by-step explanation: