Week 14 - 16

expand the brackets!

(X + 4) (X -3)

• X² + 7X - 12

• X² + X - 12

• X² - 12

• X² + 4X - 3

Expand the brackets!

(X + 5) (X - 2)

• X² + 3X - 10

• X² + 7X - 10

• X² - 10

• X² + 5X - 2

Expand the brackets!

(X - 6) (X + 3)

• X² - 3X - 18

• X² - 3X + 18

• X² - 18

• X² - 6X + 3

Expand the brackets!

(X + 7) (X - 1)

• X² + 6X - 7

• X² + 7X - 1

• X² - 7

• X² + 7X + 1

Expand the brackets!

( 3x +2 ) ( 9x -3 )

• 3x² + 27x - 6

• 9x² + 6x - 3

• 27x² + 9x - 6

• 27x² - 9x + 6

• (x - 2)(x - 3)
• (x + 2)(x + 3)
• (x - 1)(x - 6)

• (x - 4)(x - 3)
• (x + 5)(x + 2)
• (x - 1)(x - 10)
• (x - 5)(x - 2)

• The two roots are x1 = 0 and x2 = -10.
• The two roots are x1 = 5 and x2 = 2.
• The two roots are x1 = 4 and x2 = 3.
• The two roots are x1 = 6 and x2 = 1.

how many answers do we EXPECT to find if we use a quadratic formula?

(a)  

Expand the brackets!

(2X + 3) (X - 4)

• 2X² - 5X - 12

• 2X² - 8X + 3

• 2X² - 5X + 12

• 2X² + 3X - 4