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Gre4nikov [31]
2 years ago
11

The first three steps of completing the square to solve the quadratic equation 2? + 8x + 5 = 0 are shown

Mathematics
2 answers:
Kipish [7]2 years ago
7 0

Answer:

see explanation

Step-by-step explanation:

take the square root of both sides

step 4 : x + 4 = ± \sqrt{11} ( subtract 4 from both sides )

step 5 : x = - 4 ± \sqrt{11}

step 6 : x = - 4 - \sqrt{11} , x = - 4 + \sqrt{11}

Firlakuza [10]2 years ago
4 0

Answer:

x = 3/2

Step-by-step explanation:

Step 4: 2x + 8 = 11

step 5: 2x +8 - 8 = 11 -8

step 6: 2x/2 = 3/2

step 7: <u>x = 3/2</u>

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Read 2 more answers
Step 3a: Calculating the average rate
Alex73 [517]

9514 1404 393

Answer:

  a) average rate = (total distance)/(total time)

  b) Rave = 2·R1·R2/(R1 +R2)

  c) cheetah's average rate ≈ 50.91 mph

Step-by-step explanation:

a) Let AB represent the distance from A to B. Let t1 and t2 represent the travel times (in hours) on leg1 and leg2 of the trip, respectively. Then the distances traveled are...

  First leg distance: AB = 70·t1   ⇒   t1 = AB/70

  Second leg distance: AB = 40·t2   ⇒   t2 = AB/40

The average rate is the ratio of total distance to total time:

  average rate = (AB +AB)/(t1 +t2)

  average rate = 2AB/(AB/70 +AB/40) = 2/(1/70 +1/40) = 2(40)(70)/(70+40)

  average rate = 560/11 = 50 10/11 . . . mph

__

No equations are given, so we cannot compare what we wrote with the given equations. In each step of the solution, we have used the rules of algebra and equality.

b) For two rates over the same distance (as above), the average is their harmonic mean:

  average rate = 2r1·r2/(r1+r2)

__

c) The cheetah's average rate was 50 10/11 mph ≈ 50.91 mph.

4 0
3 years ago
Find all the real square roots of -196.
Slav-nsk [51]
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3 years ago
How would you find x?
Vanyuwa [196]

Answer:

A

Step-by-step explanation:

x=7

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