What would F(x) = -4x^4 - 5x^2 + 9 at x=2i be?
Answers
Answered by
4
Answer:
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Precalculus Examples
Popular Problems Precalculus Simplify (x-4)(x-2i)(x+2i)
(
x
−
4
)
(
x
−
2
i
)
(
x
+
2
i
)
Expand
(
x
−
4
)
(
x
−
2
i
)
using the FOIL Method.
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(
x
⋅
x
+
x
(
−
2
i
)
−
4
x
−
4
(
−
2
i
)
)
(
x
+
2
i
)
Simplify each term.
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(
x
2
−
2
x
i
−
4
x
+
8
i
)
(
x
+
2
i
)
Expand
(
x
2
−
2
x
i
−
4
x
+
8
i
)
(
x
+
2
i
)
by multiplying each term in the first expression by each term in the second expression.
x
2
x
+
x
2
(
2
i
)
−
2
x
i
x
−
2
x
i
(
2
i
)
−
4
x
⋅
x
−
4
x
(
2
i
)
+
8
i
x
+
8
i
(
2
i
)
Simplify terms.
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x
3
−
4
x
2
+
4
x
−
16
Answered by
1
Step-by-step explanation:
f(x)=∣x−2∣+∣x−3∣
x<2 f(x)=2−x+3−x
=5−2x
2≤x<3 f(x)=x−2+3−x
=1
x≥3 f(x)=x−2+x−3
=2x−5
f(x)=
⎩
⎪
⎪
⎨
⎪
⎪
⎧
5−2x
1
2x−5
x<2
2≤x<3
x≥3
solution
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