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garri49 [273]
3 years ago
13

What is the solution for x^2 +14x +15​

Mathematics
2 answers:
ololo11 [35]3 years ago
7 0
  • ...................................

Mademuasel [1]3 years ago
7 0

Step-by-step explanation:

the solution are

x = 1 or x = -15

x^2 + 14x - 15 =0

x^2 + 14x = 15

to write the left hand side as a perfect square we add 49 to both sides :

x^2 + 14x + 49 = 15 + 49

x^2 + 2.x.7 + 7^2 = 64

using the identity (a^2 + b^2) = a^2 + 2ab + b^2

(x + 7)^2 = 64

x + 7 = √64 or x + 7 = -√64

x = 8 - 7 or x = - 8 - 7

= 1 = - 15

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Two more questions , 15 points.
Mumz [18]

The formula that is useful for solving both of these problems is ...

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9. Given v₁=15, a=9.8, d=10, find v₂.

... (v₂)² = 15² + 2·9.8·10

... v₂ = √421 ≈ 20.5 . . . . m/s

10. Given d=12 m when a=-9.8 m/s² and v₂=0, find d when a=0.17·(-9.8 m/s²).

The formula tells us that d=(v₁)²/(2a), which is to say that the distance is inversely proportional to the acceleration. If acceleration is 0.17 times that on earth, distance will be 1/0.17 ≈ 5.88 times that on earth.

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7 0
3 years ago
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marusya05 [52]

Answer:

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Step-by-step explanation:

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N over 7= 20<br> solve for N
Blababa [14]

Answer:

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Step-by-step explanation:

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6 0
3 years ago
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Step-by-step explanation:

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2 years ago
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777dan777 [17]
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Hope this helps! :)
6 0
3 years ago
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