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cestrela7 [59]
2 years ago
7

Please solve with explanation 8 points

Mathematics
1 answer:
11111nata11111 [884]2 years ago
3 0

Answer:

See below.

Step-by-step explanation:

Given :-

x² + bx + c = 0 if x₁ + x₂ = -b and x₁x₂ = c

Solving :-

a) x₁ = 1/2 and x₂ = -3/4

=> x² + -(1/2 + -3/4)x + 1/2(-3/4)

=> x² + -(-1/4)x + (-3/8)

=> x² + 1/4x - 3/8

=> 8x² + 2x - 3 = 0

b) x₁ = 1 + √5 and x₂ = 1 - √5

=> x² + -(1 + √5 + 1 - √5)x + (1 + √5)(1 - √5)

=> x² - 2x + 1 - 5

=> x² - 2x - 4 = 0

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Pls help asap adn dont guess :DD
sashaice [31]

Answer:

{ \huge \star} \boxed{ \sqrt{3} \times 7 \sqrt{6}}{ \huge \star}  \\  =  \sqrt{3}  \times 7 \times  \sqrt{2 \times 3}  \\ =  3 \times 7 \times  \sqrt{2}  \\ =  \boxed{ 21 \sqrt{2}}

<h3><u>21√2</u> is the right answer.</h3>
3 0
3 years ago
How many nines are in 63?
dem82 [27]

Answer:

7

Step-by-step explanation:

9×7 = 63

8 0
3 years ago
Building a is 271 meters taller than building
kvv77 [185]

Let a and b represent the heights of the corresponding buildings (in meters).

... a = b +271 . . . . . . . a is 271 meters taller than b

... 2b -a = 211 . . . . . . if a is subtracted from twice b, the result is 211

Use the expression for a in the first equation to substitute for a in the second.

... 2b - (b+271) = 211

... b = 482 . . . . . . . . . . . simplify and add 271

... a = b +271 = 753

Building a is 753 meters tall; building b is 482 meters tall.

4 0
3 years ago
3926%13. I got 309 r9. What is it and what did I do wrong.
kondaur [170]
3926/13 =302 but I'm not 100% sure where you went wrong do you have any work?


6 0
3 years ago
I need help.. 
Debora [2.8K]
This is exactly like the one with the 'n's that you posted yesterday.
I guess you didn't get enough help on that one to understand it.

<span><u>7k/8 - 3/4 - 5k/16 = 3/8</u>

3/4 is the same as 6/8.
Add it to each side of the equation:

7k/8         - 5k/16 = 9/8

Multiply each side by 16 :

14k - 5k = 18

Add up the 'k's on the left side:

9k = 18

From this point, you can proceed directly to the numerical value of 'k'
if you need it.<u />

In your question, you said you need help, and I showed you how to
strip the problem down so that the only thing left is ' k = something '.
Giving you the answer is no help.  Nobody actually needs the answer.
</span>


8 0
3 years ago
Read 2 more answers
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