72+(n-1)*-4=0
please calculate fast and show calculations
(the answer should be 19)
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Answer:
Re-order terms so that constants are on the left
7
2
+
(
−
1
)
(
−
4
)
=
0
72+(n-1)\left({\color{#c92786}{-4}}\right)=0
72+(n−1)(−4)=0
7
2
−
4
(
−
1
)
=
0
72{\color{#c92786}{-4}}(n-1)=0
72−4(n−1)=0
2
Distribute
7
2
−
4
(
−
1
)
=
0
72{\color{#c92786}{-4(n-1)}}=0
72−4(n−1)=0
7
2
−
4
+
4
=
0
72{\color{#c92786}{-4n+4}}=0
72−4n+4=0
3
Add the numbers
7
2
−
4
+
4
=
0
{\color{#c92786}{72}}-4n+{\color{#c92786}{4}}=0
72−4n+4=0
7
6
−
4
=
0
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