Perform the indicated operations
(
25
z
2
+
27
z
+
21
)
−
[
(
−
3
z
2
−
z
+
10
)
−
(
−
20
z
2
−
15
z
−
14
)
]
\displaystyle {\left({25}{z}^{{2}}+{27}{z}+{21}\right)}-{\left[{\left(-{3}{z}^{{2}}-{z}+{10}\right)}-{\left(-{20}{z}^{{2}}-{15}{z}-{14}\right)}\right]}
(
25
z
2
+
27
z
+
21
)
−
[
(
−
3
z
2
−
z
+
10
)
−
(
−
20
z
2
−
15
z
−
14
)
]
Ans =
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