Հանրահաշիվ 9

156.(x-3) (x+2)-14:


(
𝑥

3
)
(
𝑥
+
2
)
(x−3)(x+2):

(
𝑥

3
)
(
𝑥
+
2
)
=
𝑥
2
+
2
𝑥

3
𝑥

6
=
𝑥
2

𝑥

6
(x−3)(x+2)=x
2
+2x−3x−6=x
2
−x−6
Subtract 14 from the result

𝑥
2

𝑥

6

14
=
𝑥
2

𝑥

20
x
2
−x−6−14=x
2
−x−20


𝑥
2

𝑥

20
x
2
−x−20



157. (x-5) (x-7)=48:

x
2


𝑥
2

12
𝑥
+
35

48
=
0
x
2
−12x+35−48=0


𝑥
2

12
𝑥

13
=
0
x
2
−12x−13=0



159, (x-4)(+8)-11:


8
𝑥

32

11
=
8
𝑥

43
8x−32−11=8x−43


8
𝑥

43
8x−43

161. (2x-1) (x-3)-2: