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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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wlad13 [49]

Answer:

y = 4

Step-by-step explanation:

because 5 x 4 = 20 and 20 × 4 = 80 and so on y is equal to four

6 0
2 years ago
Plzz hurry<br> 12/19(x-22)=38-6x-3
nadya68 [22]

Answer:

x = 929/126

Step-by-step explanation:

12/19(x-22)=38-6x-3

Combine like terms

12/19(x-22)=35-6x

Multiply each side by 19

19* 12/19(x-22)=19*(35-6x)

12( x-22) = 19*(35-6x)

Distribute

12x - 264 = 665 - 114x

Add 114x to each side

12x +114x - 264 = 665 - 114x+114x

126x -264 = 665

Add 264 to each side

126x-264+264 = 665+264

126x = 929

Divide each side by 126

126x/126 = 929/126

x = 929/126

4 0
3 years ago
Read 2 more answers
What number is half way between 21 and 63?
andre [41]
The # halfway in between 21 and 63 is 42.
8 0
3 years ago
I need help !! I don’t understand this one
Tasya [4]

Answer:

I think it's the 3rd one

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2 years ago
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