Answer:
−4x2+5x−28
Step-by-step explanation:
3
2
+
5
−
7
(
2
+
4
)
3x^{2}+5x-7(x^{2}+4)
3x2+5x−7(x2+4)
Simplify
1
Distribute
3
2
+
5
−
7
(
2
+
4
)
3x^{2}+5x{\color{#c92786}{-7(x^{2}+4)}}
3x2+5x−7(x2+4)
3
2
+
5
−
7
2
−
2
8
3x^{2}+5x{\color{#c92786}{-7x^{2}-28}}
3x2+5x−7x2−28
2
Combine like terms
3
2
+
5
−
7
2
−
2
8
{\color{#c92786}{3x^{2}}}+5x{\color{#c92786}{-7x^{2}}}-28
3x2+5x−7x2−28
−
4
2
+
5
−
2
8
{\color{#c92786}{-4x^{2}}}+5x-28
−4x2+5x−28
Solution
−
4
2
+
5
−
2
8
