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Eddi Din [679]
3 years ago
10

Y=4x^2+x-1 solve using quadratic formula

Mathematics
1 answer:
melamori03 [73]3 years ago
7 0

Answer:

x = sqrt(17)/8 - 1/8 or x = -1/8 - sqrt(17)/8

Step-by-step explanation using the quadratic formula:

Solve for x over the real numbers:

4 x^2 + x - 1 = 0

Divide both sides by 4:

x^2 + x/4 - 1/4 = 0

Add 1/4 to both sides:

x^2 + x/4 = 1/4

Add 1/64 to both sides:

x^2 + x/4 + 1/64 = 17/64

Write the left hand side as a square:

(x + 1/8)^2 = 17/64

Take the square root of both sides:

x + 1/8 = sqrt(17)/8 or x + 1/8 = -sqrt(17)/8

Subtract 1/8 from both sides:

x = sqrt(17)/8 - 1/8 or x + 1/8 = -sqrt(17)/8

Subtract 1/8 from both sides:

Answer: x = sqrt(17)/8 - 1/8 or x = -1/8 - sqrt(17)/8

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Answer:

( 11   -6)

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Step-by-step explanation:

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Erin and dan went shopping at their local store. Erin bought shirts that cost $12 each and spent $18 on accessories. Dan bought
andrezito [222]

Answer:

2

Step-by-step explanation:

I  think below is your full question:

<em>Erin and Dan went shopping at their local store. Erin bought shirts that cost $12 each and spent $18 on accessories. Dan bought the same number of shirts as Erin for $16 each and spent $10 on accessories. </em>

<em>If Erin and Dan were billed the same amount by the store, how many shirts did each of them buy?</em>

Here is my answer

Let  x is number of shirts

Person             COST              

ERIN                12x+18

DAN                 16x+10

Equally Billed    12x+18=16x+10 <=> x = 2

so each of them buy 2 shirts

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4 years ago
What are the coordinates of the midpoint of the segment whose endpoints are (-4,6) and (-8,-2)
umka2103 [35]
The formula to find the midpoint of a segment is ((x1 + x2)/2,),(y1 + y2)/2).

The x coordinate of the first point is -4, and the x coordinate of the second point is -8.  The y coordinate of the first point is 6, and the y coordinate of the second point is -2.  Now, we can plug these into our formula.

((-4 + (-8))/2), (6 + (-2))/2)) = (-12/2), (4/2) = (-6, 2)

So, (-6, 2) is the midpoint of the segment.
4 0
3 years ago
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