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Jawaban:

1. x^2+11x+30= 0

a= x^2= 1

b= x= 11

c= 30

2. *,Gunakan cara yang sama seperti no. 1

a= 3

b= -13

c= -10

3. x^2+11x+30= 0

x^2+5x+6x+30= 0

x(x+5) + 6(x+5)= 0

(x+6) (x+5)= 0

x= -6 x=-5

4. 2x^2+5x-3= 0

2x^2+6x-x-3= 0

2x(x+3)- (x-3) =0

(2x-1) (x-3) =0

2x-1=0 x= 3

2x= 1

x= 1/2

5. x1×x2= -b/a

x1×x2= -(-3)/1

= 3

6. x1×x2= c/a

x1×x2= -10/1

= -10

7. D= b^2- 4ac

= 6^2- 4.1.9

= 36- 36

= 0

8. *, Gunakan cara seperti no. 7

D= b^2- 4ac

= 3^2- 4.2.(-5)

= 9- (-40)

= 49

9. x^2-12+20= 0

x^2-2x-10x+20= 0

x(x-2) – 10(x-2)= 0

(x-10) (x-2)= 0

x= 10 x=2

10. x^2-7x+6= 0

x^2-x-6x+6=0

x(x-2) – 6(x-1)= 0

(x-6) (x-1)= 0

x= 6 x=1