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LenKa [72]
3 years ago
12

Solve for x. x^2+4x-21=0 A. -3, -7 B. -3, 7 C. 3, -7 D. 3, 7

Mathematics
1 answer:
Free_Kalibri [48]3 years ago
8 0

Answer:

x = 3 and x = -7

Step-by-step explanation:

The method I used is the x method, where you place the constant on the top and the coefficient of the second term on the bottom. From there, you find two numbers that multiply to get the top number (21) and add to give the bottom number (4).

You should get -3 and 7. You should be able to rewrite the equation as so:

(x - 3) (x + 7)

Set both equal to zero separately and solve:

x - 3 = 0

x = -3

x + 7 = 0

x = -7

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6 0
3 years ago
The point M(-6, -4) is translated 2 units right. What are the coordinates of the resulting point, M′?
fredd [130]
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Remember: (-6, -4)
X = -6
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If you move 2 units to the right (x-axis) you go from -6 + 2 which equals -4. And again, you’re not moving up and down so your
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Answer:

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3 0
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Explain how both are correct./ bc I have the answer but I didn’t explain
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5 0
3 years ago
If f(x)=2x+5 , determine the value of f(3x) .
makvit [3.9K]

Answer:

Step-by-step ef(x)=-2x+5……i

and f(-3x)=?

let x=-3x so that

-2x+5=-3x

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substitutinx x into… i

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now f(–3x)=f(-15)

scrutinizing… ii ,we can propose that

f(-15)=15.

Thus f(-3x)=15xplanation:

7 0
2 years ago
Read 2 more answers
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