EduSahara™ Assignment
Name : Solving some complex Quadratic Equations - 2
Chapter : Quadratic Equations
Grade : ICSE Grade X
License : Non Commercial Use
Question
1
1.
Solve :
(
x
(
x
+
1
)
)
2
−
15
(
x
(
x
+
1
)
)
+
56
= 0
(i)
(
-10
7
)
,
(
-3
2
)
(ii)
(
-6
5
)
,
(
-5
4
)
(iii)
(
-8
7
)
,
(
-7
6
)
(iv)
(
-10
9
)
,
(
-9
8
)
(v)
(
-6
7
)
,
(
-5
6
)
Question
2
2.
Solve :
√
(
−
x
+
8
)
=
(
x
+
8
)
(i)
(
−
17
2
√
4
+
1
2
√
65
)
,
(
−
17
2
√
4
−
1
2
√
65
)
(ii)
(
−
17
2
√
5
+
1
2
√
65
)
,
(
−
17
2
√
5
−
1
2
√
65
)
(iii)
(
−
17
2
+
1
2
√
195
)
,
(
−
17
2
−
1
2
√
195
)
(iv)
(
−
17
2
+
1
2
√
130
)
,
(
−
17
2
−
1
2
√
130
)
(v)
(
−
17
2
+
1
2
√
65
)
,
(
−
17
2
−
1
2
√
65
)
Question
3
3.
Solve :
√
(
−
5
x
2
−
21
x
+
54
)
=
(
x
−
3
)
(i)
(
−
5
4
+
1
4
√
290
)
,
(
−
5
4
−
1
4
√
290
)
(ii)
(
−
5
4
+
1
4
√
435
)
,
(
−
5
4
−
1
4
√
435
)
(iii)
(
−
5
4
√
4
+
1
4
√
145
)
,
(
−
5
4
√
4
−
1
4
√
145
)
(iv)
(
−
5
4
√
5
+
1
4
√
145
)
,
(
−
5
4
√
5
−
1
4
√
145
)
(v)
(
−
5
4
+
1
4
√
145
)
,
(
−
5
4
−
1
4
√
145
)
Question
4
4.
Solve :
4
(
−
x
)
+
3
(
−
x
+
4
)
=
−
4
(i)
4
√
2
,
1
(ii)
4
√
4
,
2
(iii)
4
,
0
(iv)
4
√
3
,
(
−
1
)
(v)
4
√
5
,
(
−
2
)
Question
5
5.
Solve :
−
5
(
−
x
−
1
)
+
4
(
x
+
2
)
=
4
(
x
+
3
)
(i)
(
−
29
10
√
5
−
1
10
√
161
)
,
(
−
29
10
√
5
+
1
10
√
161
)
(ii)
(
−
29
10
√
4
−
1
10
√
161
)
,
(
−
29
10
√
4
+
1
10
√
161
)
(iii)
(
−
29
10
−
1
10
√
483
)
,
(
−
29
10
+
1
10
√
483
)
(iv)
(
−
29
10
−
1
10
√
161
)
,
(
−
29
10
+
1
10
√
161
)
(v)
(
−
29
10
−
1
10
√
322
)
,
(
−
29
10
+
1
10
√
322
)
Question
6
6.
Solve :
−
4
√
11
x
2
+
5
x
+
4
√
11
=
0
(i)
√
11
(
−
4
√
4
)
,
4
√
44
(ii)
√
11
(
−
4
)
,
4
√
44
(iii)
√
44
(
−
4
)
,
4
√
4
√
11
(iv)
√
11
(
−
4
)
,
4
√
11
(v)
√
44
(
−
4
)
,
4
√
11
Question
7
7.
Solve :
−
21
x
2
+
4
√
13
x
+
13
=
0
(i)
√
13
3
√
4
,
√
13
(
−
7
√
4
)
(ii)
√
52
3
,
√
52
(
−
7
)
(iii)
√
13
3
,
√
13
(
−
7
√
4
)
(iv)
√
13
3
,
√
13
(
−
7
)
(v)
√
52
3
,
√
13
(
−
7
)
Question
8
8.
Solve :
3
x
2
−
9
√
3
x
+
18
=
0
(i)
3
√
3
,
6
√
3
(ii)
3
√
4
√
3
,
6
√
4
√
3
(iii)
3
√
4
√
3
,
6
√
3
(iv)
3
√
12
,
6
√
12
(v)
3
√
3
,
6
√
12
Question
9
9.
Solve :
x
2
+
8
x
+
13
=
0
(i)
(
−
4
+
3
)
,
(
−
4
−
3
)
(ii)
(
−
4
+
√
3
)
,
(
−
4
−
√
3
)
(iii)
(
−
4
+
√
6
)
,
(
−
4
−
√
6
)
(iv)
(
−
4
√
5
+
√
3
)
,
(
−
4
√
5
−
√
3
)
(v)
(
−
4
√
4
+
√
3
)
,
(
−
4
√
4
−
√
3
)
Question
10
10.
Find the roots of the quadratic equation correct to two decimal places
(
6
x
2
+
20
x
−
16
)
=
0
(i)
2.67 , 7.00
(ii)
7.67 , 3.00
(iii)
1.67 , 4.00
(iv)
8.67 , 4.00
(v)
0.67 , -4.00
Assignment Key
1) (iii)
2) (v)
3) (v)
4) (iii)
5) (iv)
6) (iv)
7) (iv)
8) (i)
9) (ii)
10) (v)
