Write the following in the form
x
+
a
2
+
b
Question 1:
x
2
+
15
x
−
7
x
+
15
2
2
−
253
4
Question 2:
x
2
+
15
x
−
7
x
+
15
2
2
−
253
4
Question 3:
x
2
−
6
x
−
4
x
−
3
2
−
13
Question 4:
x
2
+
x
+
7
x
+
1
2
2
+
27
4
Question 5:
x
2
−
11
x
−
7
x
−
11
2
2
−
149
4
Question 6:
x
2
−
8
x
−
3
x
−
4
2
−
19