Lesson2️⃣Factorising Quadratic Expressions

Question 1

Factorise
x² + 8x + 12

Answer 1

So…x12, +8. What two numbers multiply to 12 and add to 8? 2&6 so
(x+2) (x+6)

Question 2

x² + 5x + 6

Answer 2

So x6,+5. What two numbers multiply to 6 and add to 5? 3&2 so
(x+3) (x+2)

Question 3

x² +2x +1

Answer 3

So x1 and +2 what two numbers multiply to 1 and add to 2? 1&1 so…
(x+1) (x+1)

Question 4

x ² - 7x + 10

Answer 4

(x-2) (x-5)

Question 5

x² - 9x + 18

Answer 5

(x-3) (x-6)

Question 6

x ² - 12x + 27

Answer 6

(x-9) (x-3)

Question 7

x ² + 2x -24

Answer 7

(x-4) (x+6)

Question 8

x ² -x -30

Answer 8

(x-6) (x+5)