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Svetllana [295]
3 years ago
13

Find the value of f(3) if f(x) = 4x^2 - 8x 3. a. 3 b. 12 c. 15 d. 18

Mathematics
1 answer:
Vladimir [108]3 years ago
3 0
I hope this helps you



x=3



f (3)=4.3^2-8.3+3



f (3)=36-24+3=15



f (3)=4.3^2-8.3-3=36-24-3=5
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8x^(2)+16x=42 completeing the square
Yuri [45]
16
x
2
+
16
x
=
42
Step 2: Subtract 42 from both sides.
16
x
2
+
16
x
−
42
=
42
−
42
16
x
2
+
16
x
−
42
=
0
For this equation: a=16, b=16, c=-42
16
x
2
+
16
x
+
−
42
=
0
Step 3: Use quadratic formula with a=16, b=16, c=-42.
x
=
−
b
±
b
2
−
4
a
c
2
a
x
=
−
(
16
)
±
(
16
)
2
−
4
(
16
)
(
−
42
)
2
(
16
)
x
=
−
16
±
2944
32
x
=
−
1
2
+
1
4
46
or
x
=
−
1
2
+
−
1
4
46
Answer:
x
=
−
1
2
+
1
4
46
or
x
=
−
1
2
+
−
1
4
46
7 0
3 years ago
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