solving problems multiplying polynomials C8

Find the area of a rectangle whose lenght is 2x + 8 and width y +8

• 3xy+10x+8y+64

• 2xy+16x+8y+64

• 2xy-16x+8y+64

(a² − 2a) × (a + 2b − 3c)

• a³ − 2a² + 2a²b − 3a²c− 4ab + 6ac

• a³ + 2a² + 2a²b − 3a²c− 4ab + 6ac

• a³ − 2a² + 2ab² − 3a²c− 4ab - 6ac

(4x+1)(5x−2)

• 20x² + 3x − 2
• 20x² − 11x + 5
• 20x² − 18x + 2
• 20x² − 3x − 2

(5x+1)(x+4)

• 5x² + 19x − 4
• 5x² + 21x + 4
• 5x² + 4
• 5x² − 19x − 4

(2x − 3)(2x + 3)

• 4x² − 12x + 9
• 4x² − 9
• 4x² + 9
• 4x² + 6x − 9