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drek231 [11]
3 years ago
5

How do i do the quadratic formula

Mathematics
1 answer:
qwelly [4]3 years ago
7 0
Quadratic formula is

x = -b + or - sqrt b^2-4ac / 2a

Just plug in your numbers... let's say we have x^2 + 4x + 8 = 0
Plug it in.

x = -(-4) +/- sqrt (4)^2 - 4(1)(8)/2(1)
x = 4 +/- sqrt 16-32 / 2
x = 4+/- sqrt -16/2 (no real solutions)

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Answer:

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Step-by-step explanation:

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3 years ago
Which point is in the solution set of the given system of inequalities?
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Answer:

C

Step-by-step explanation:

To determine which point is a solution substitute the coordinates into both inequalities and check validity

A (2, 0 )

2 + 0 = 2  ← not greater than 2

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The point (2, 0) is not a solution as it does not satisfy the first inequality

B (0, 2 )

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The point (0, 2) is not a solution as it does not satisfy the first inequality

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5 0
3 years ago
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What number does x stand for in this equation?<br><br> -7x + 6=27
AURORKA [14]
⓵ You need to solve the left side first in order to isolate the × and find it’s value :

-7× + 6 = 27
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↓

-7× = 21
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↓

× = -3

If you find it too difficult to divide a number by a negative, just divide 21 by 7 and always remember that when dividing, when the signs are different the answer is negative. So knowing that you could just divide 21 by 7, which is 3, and add a negative sign in front!


I hope this helped, if there’s anything let me know! ☻
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