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Factoring
A
B
C
D
E
F
G
. . . .

Factoring Other Trinomials

Trinomials in the Form x 2 + ( a + b ) x + a b


Example

Factor each trinomial.

1. a 2 +11a+18
2. x 2 −22x+21
3. b 2 −2b−24
4. y 2 +14y−72

Solution
1. a 2 +11a+18=(a+2)(a+9)

2. x 2 −22x+21=(x−1)(x−21)
3. b 2 −2b−24=(b−6)(b+4)

4. y 2 +14y−72=(y−4)(y+18)