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3 years ago

What are the solutions to the quadratic equation x2 - 16 = 0?

Mathematics

1 answer:

enot [183]3 years ago

7 0

X=4 x=-4 Due to the difference in squares theorem

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Consider the problem of finding the line of symmetry and vertex of the quadratic equation f(x) =x^2-8x+15 What is the error in t

Elenna [48]

$\bf \textit{ vertex of a vertical parabola, using coefficients}\\\\
\begin{array}{llccll} f(x) = &{{ 1}}x^2&{{ -8}}x&{{ +15}}\\
&\uparrow &\uparrow &\uparrow \\
&a&b&c
\end{array}\qquad 
\left(-\cfrac{{{ b}}}{2{{ a}}}\quad ,\quad {{ c}}-\cfrac{{{ b}}^2}{4{{ a}}}\right)
\\\\\\
\textit{so the line of symmetry will be at }x=-\cfrac{{{ b}}}{2{{ a}}}$

3 0

3 years ago

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A realtor a lock box to store the keys to a house that is for sale. The access code for the lock box consists of five digits. Th

guapka [62]

Answer:

36,000 possible codes.

Step-by-step explanation:

I guess you want the total number of arrangements possible.

The first digit can be any number from 0 to 8. the middle numbers must each be any number from 0 to 9 and the last digit must be 2,4,6 or 8.

So the number of arrangements possible = 9 * 10 * 10 * 10 * 4

= 36,000.

6 0

2 years ago

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Hey! Solving linear equations with integers! i don’t think it should be that hard since it’s practice, I just need some help wit

Dmitriy789 [7]

Solution 1 :-

>> -3 (3 - x) = 2x + 5

>> -3 × (3 - x) = 2x + 5

>> -9 + 3x = 2x + 5

>> 3x - 2x = 9 + 5

>> x = 14

Solution 2 :-

>> -6 - 9p = 3p

>> -9p - 3p = 6

>> -12p = 6

>> p = -1/2

Solution 3 :-

>> -5 (-4 - a) = 3a + 8

>> -5 × (-4 - a) = 3a + 8

>> 20 + 5a = 3a + 8

>> 5a - 3a = 8 - 20

>> 2a = -12

>> a = -12 / 2

>> a = -6

Solution 4 :-

>> s - 6 = -5s

>> s + 5s = 6

>> 6s = 6

>> s = 6 / 6

>> s = 1

8 0

1 year ago

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A party rental company has chairs and tables for rent. The total cost to rent 7 chairs and 9 tables is $91. The total cost to re

jonny [76]

Answer:

Step-by-step explanation:

3 0

2 years ago

Simplify the following expression: (5x2 + 3x + 4) − (2x2 − 6x + 3). If the final answer is written in the form Ax2 + Bx + C, wha

Ratling [72]

Combine like terms. remember to keep the signs.

5x² - 2x² = 3x²
3x - (-6x) = 3x + 6x = 9x
4 - (-3) = 7

3x² + 9x + 7 = Ax² + Bx + C

9 = B, because 9 is in the B's place

9 is your answer

hope this helps

6 0

2 years ago

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