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SVEN [57.7K]
3 years ago
6

I need help with 1-2.b

Mathematics
1 answer:
olya-2409 [2.1K]3 years ago
7 0

Answer:

it is a i thick

Step-by-step explanation:

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Complete the square to find the minimum value of the expression 4x2 + 8x + 23.
Tcecarenko [31]
So you need to come up with a perfect square that works for the x coefficients.
like.. (2x + 2)^2
(2x+2)(2x+2) = 4x^2 + 8x + 4
Compare this to the equation given. Our perfect square has +4 instead of +23. The difference is: 23 - 4 = 19

I'm going to assume the given equation equals zero..

So, If we add subtract 19 from both sides of the equation we get the perfect square.

4x^2 + 8x + 23 - 19 = 0 - 19
4x^2 + 8x + 4 = - 19
complete the square and move 19 over..
(2x+2)^2 + 19 = 0
factor the 2 out becomes 2^2 = 4
ANSWER: 4(x+1)^2 + 19 = 0

for a short cut, the standard equation
ax^2 + bx + c = 0 becomes a(x - h)^2 + k = 0
Where "a, b, c" are the same and ..
h = -b/(2a)
k = c - b^2/(4a)

Vertex = (h, k)
this will be a minimum point when "a" is positive upward facing parabola and a maximum point when "a" is negative downward facing parabola.


3 0
2 years ago
Write as a whole number 2.2 x 10 -8
leonid [27]
The answer is 14
2.2×10=22
22-8 is 14
7 0
2 years ago
Round your answer to the nearest hundredth.<br> с<br> B<br> 40°<br> ?<br> 7<br> А
igor_vitrenko [27]

Answer:

take 40 degree as reference angle

using sine rule

let opposite be x

sine 40=opposite/hypotenuse

0.64=x/7

0.64*7=x

4.48=x

Step-by-step explanation:

3 0
2 years ago
3a2 + 2a + 2a2 is equal to​
yanalaym [24]

Answer:

  5a^2 +2a

Step-by-step explanation:

Like terms are ones with the same exponent of x. They can be combined.

  3a^2 +2a +2a^2

  = (3a^2 +2a^2) +2a

  = (3+2)a^2 +2a

  = 5a^2 +2a

4 0
2 years ago
Read 2 more answers
A store normally sells a floor lamp for $83.99. The store is having a sale that reduces the lamp's price by 15%. How much does t
-Dominant- [34]
The answer should be $71.39
4 0
2 years ago
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