subject
Mathematics, 01.01.2020 07:31 Gabr02

Ofind the minimum value of the quadratic expression βˆ’4x2+8xβˆ’25,
βˆ’
4
x
2
+
8
x
βˆ’
25
,
marla used the following steps to complete the square:

step 1: βˆ’4(x2+8x)βˆ’25
βˆ’
4
(
x
2
+
8
x
)
βˆ’
25

step 2: βˆ’4(x2+8x+16βˆ’16)βˆ’25
βˆ’
4
(
x
2
+
8
x
+
16
βˆ’
16
)
βˆ’
25

step 3: βˆ’4(x2+8x+16)+64βˆ’25
βˆ’
4
(
x
2
+
8
x
+
16
)
+
64
βˆ’
25

step 4: βˆ’4(x+4)2+39
βˆ’
4
(
x
+
4
)
2
+
39

did marla use the correct steps to complete the square?

ansver
Answers: 3

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You know the right answer?
Ofind the minimum value of the quadratic expression βˆ’4x2+8xβˆ’25,
βˆ’
4
x
2
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