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23.11.2020 •
Mathematics
Simplify the following
-(3z)^2
A. 6z
B. 9z^2
C. -9z^2
D. -6z^2
E. 6z^2
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Ответ:
Step-by-step Explanation:
x
+
y
=
1
x
+
y
−
y
=
1
−
y
So
x
=
1
−
y
Substitute this x-value into the second equation.
(
1
−
y
)
−
y
=
2
1
−
2
y
=
2
1
−
2
y
−
1
=
2
−
1
−
2
y
=
1
−
2
y
−
2
=
1
−
2
y
=
−
0.5
Substitute this answer into the original formula
x
+
(
−
0.5
)
=
1
x
+
(
−
0.5
)
+
(
0.5
)
=
1
+
(
0.5
)
x
=
1.5
Check by substituting into the second formula.
1.5
−
(
−
0.5
)
=
2
2
=
2