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Nesterboy [21]
3 years ago
13

What number must you add to complete the square? X2+8x=-3 A. 8 B. 16 C. 4 D. 64

Mathematics
2 answers:
GREYUIT [131]3 years ago
4 0

Answer:

I think it is 16

mihalych1998 [28]3 years ago
3 0
The answer is most likely b)16
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Can you solve this? I need help. I don't understand.
ZanzabumX [31]

Answer:

2 sqrt(5) OR 4.5

Step-by-step explanation:

You have to know Pythagorean theorem to solve this question.

a^2 + b^2 = c^2

To use this theorem you have to have a right triangle. There are two right triangles in your image. The lower (larger) one has two sides labeled, so you can use Pythagorean thm to find the third side. There's a short cut, bc some right triangles have easy-to-memorize lengths of the sides. 3-4-5 is one of these number sets. A multiple of this is 6-8-10. We could've solved:

b^2 + 8^2 = 10^2

But it would've come out the same. The unlabeled side is 6.

We can use the 6 and the 4 on the smaller right triangle and use the Pythagorean thm again to solve for x.

4^2 + x^2 = 6^2

16 + x^2 = 36 subtract 16 from both sides.

x^2 = 20

Take the square root of both sides.

sqrt (x^2) = sqrt 20

x = 2 sqrt(5) which is approximately 4.472.

2 sqrt(5) is an exact answer if that is what they are asking for. 4.472 is an approximation to the nearest thousandth. It would be 4.47 to the nearest hundredth or 4.5 to the nearest tenth.

8 0
2 years ago
Help me with this geometry question please I need it quick
stealth61 [152]
I got 25 (24.738634) sry if wrong
8 0
3 years ago
HELP PLEASE ANSWER!!!!
Basile [38]

Answer: AAS

Step-by-step explanation:

Two sides are congruent, two angles are congruent, and vertical angles are congruent

5 0
3 years ago
Help ASAP please
Marizza181 [45]
The population decreases by 4118 so the previous population was 18,318
5 0
3 years ago
Need help on this quickly! i have 2 more questions like this that i will post if it lets me.
AfilCa [17]

Answer:

x=5 , y=12

Angle 3=140

Angle 4=100

4 0
3 years ago
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