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harina [27]
3 years ago
11

Solve x2 - 8x = 3 by completing the square. Which is the solution set

Mathematics
1 answer:
Simora [160]3 years ago
3 0

Answer:

4\pm\sqrt{19}

Step-by-step explanation:

Move everything to left side

x^{2} -8x -3 =0

Now to solve this square equation we need to find Descriminant

D=b^{2} -4ac=64+12=76

As Descriminant D is greater than 0 then we have 2 solutions which we can calculate by this formula

x_{1,2}=\frac{-b\pm\sqrt{D}}{2a} =\frac{8\pm2\sqrt{19}}{2}=4\pm\sqrt{19}

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F(x)=-x^2-9x find f(-2)
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Answer:

14

Step-by-step explanation:

put -2 where x is

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f(-2)= -4 + 18

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8 0
3 years ago
What value of x makes the equation true?
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This one is easy.
<span>–8.6 = –4.1 + x
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The answer is B
3 0
3 years ago
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Hoochie [10]

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6 0
3 years ago
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If the area of a circle is 58 square feet, find the circumference. A. 22.35 ft. B. 26.99 ft. C. 4.25 ft. D. 42.5 ft.
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Answer:

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Step-by-step explanation:

The formulas for circumference (C) and area (A) are ...

  A = πr²

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Solving the area formula for r, we get ...

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Substituting this into the circumference formula gives ...

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For the given circle, the numbers are ...

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