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nataly862011 [7]
2 years ago
10

Someone please help me I got this incorrect & I’m really struggling

Mathematics
2 answers:
Marianna [84]2 years ago
8 0

Answer:

X=5or -2

Step-by-step explanation:

x²-3x-10=0

x²-(5-2)x-10=0

x²-5x+2x-10=0

x(x-5)+2(x-5)=0

(x-5)(x+2)=0

either Or

x-5=0 x+2=0

x=5 x=-2

Phantasy [73]2 years ago
5 0
(x-5) = 0 or (x+2)=0
so x could be 5 or -2
i guess, u can check it with calculator
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Write a polynomial with the zeros equaling to -1,1,8
Andreyy89

Answer:x³-8x²-x+8

Step-by-step explanation:

x are equal to -1,1,8 respectively

to form the polynomials just simply use this method put (x-)to the given numbers that are zeros of the polynomials

(x-(-))(x-1)(x-8)

(x+1)(x-1)(x-8) →(x+1)(x-1) are diff. of two squares (x²-1)

(x²-1)(x-8)

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4 0
3 years ago
Derive the equation of the parabola with a focus at (-5,5) and a directix of y = -1
Paladinen [302]

Answer:

D

Step-by-step explanation:

From any point (x, y) on the parabola the focus and directrix are equidistant

Using the distance formula

\sqrt{(x+5)^2+(y-5)^2} = | y + 1 |

Squaring both sides

(x + 5)² + (y - 5)² = (y + 1)^2 , that is

(y + 1)² = (x + 5)² + (y - 5)² ← subtract (y - 5)² from both sides

(y + 1)² - (y - 5)² = (x + 5)² ← expand left side and simplify

y² + 2y + 1 - y² + 10y - 25 = (x + 5)²

12y - 24 = (x + 5)² ← factor left side

12(y - 2) = (x + 5)² ← divide both sides by 12

y - 2 = \frac{1}{12} (x + 5)² ← add 2 to both sides

y = \frac{1}{12} (x + 5)² + 2

or

f(x) = \frac{1}{12} (x + 5)² + 2 → D

7 0
3 years ago
A group of friends wants to go to the amusement park. They have no more than $ 100 to spend on parking and admission. Parking is
zzz [600]

Answer:

Step-by-step explanation:

Based on the information given in the question, the inequality which can be used to determine x, the number of people who can go to the amusement park will be:

8 + 23(x) ≤ 100

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23x ≤ 100 - 8

23x ≤ 92

x ≤ 92/23

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The number of people that can go to the amusement park will be at most 4

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3 years ago
6 text 3/4 of a minute what was his rate of texting
Ilya [14]

<em>Answer:</em>

<em>8</em>

<em>Step-by-step explanation:</em>

<em>6:0.75</em>

<em>0.75 divided by 0.75=1</em>

<em>6 divided by 0.75=8</em>

<em>8:1</em>

<em>Best,</em>

<em>SunflowerJada</em>

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Answer:

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Step-by-step explanation:

3 0
2 years ago
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