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3 years ago

How many real solution does the quadratic equation x^2 + 11 + 8x =0

Mathematics

2 answers:

lions [1.4K]3 years ago

5 0

Answer:

The discrimant is 20 so the equation has two distinct solutions in the real number.

Step-by-step explanation:

Discriminant

B² - 4AC

8² - 4(1)(11)

64 - 44

20 > 0

Real and distinct roots

alekssr [168]3 years ago

5 0

Answer:

why r u mean i was right i did the test

Step-by-step explanation:

all off it equls up to 20 and i should have said so

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Please help me on this

avanturin [10]

Answer:

1. 8

2. 11

3. 14

4. 17

Step-by-step explanation:

When there is a number next to a number inside parenthesis, it means you multiply those together. Don't forget to use PEMDAS either. So you first multiply 3(and whatever number is inside) and then add 5. Hope this helped :)

5 0

3 years ago

Use the intersect method to solve the equation x^2-1=-x^2+7

olga55 [171]

Answer:

The solutions of the equation x^2-1=-x^2+7 are (-2,3) and (2,3)

Step-by-step explanation:

Please, see the attached file.

Thanks.

4 0

3 years ago

Given that <img src="https://tex.z-dn.net/?f=I_0%20%3D%2010%5E-12" id="TexFormula1" title="I_0 = 10^-12" alt="I_0 = 10^-12" alig

Alex Ar [27]

The intensity of sound which the decibel level of the sound measures 156 is 3.981 × 10³ W/m²

Decibel level, dB = 10log₁₀(I/I₀) where dB = decibel level = 156, I = intensity at 156 dB and I₀ = 10⁻¹² W/m².

Since we require I, making I subject of the formula, we have

dB/10 = log₁₀(I/I₀)

$\frac{I}{I_{0} } = 10^{\frac{dB}{10} } \\I = I_{0} 10^{\frac{dB}{10} }$

Substituting the values of the variables into the equation, we have

$I = I_{0} 10^{\frac{dB}{10} }\\I = 10^{-12} 10^{\frac{156}{10} }\\I = 10^{-12} 10^{15.6}\\I = 10^{15.6-12} \\I = 10^{3.6} W/m^{2}$

I = 3981.072W/m²

I = 3.981 × 10³ W/m²

So, the intensity of sound which the decibel level of the sound measures 156 is 3.981 × 10³ W/m²

Learn more about intensity of sound here:

brainly.com/question/4431819

3 0

3 years ago

Abigail went shopping for her sister's birthday. She spent 2/7 of her money on a necklace and 3/4 of the remainder on new outfit

DochEvi [55]

<span>Abigail went shopping for her sister's birthday. She spent 2/7 of her money on a necklace and 3/4 of the remainder on new outfits. She had $56.00 left. How much money did Abigail spend on the necklace? (PLEASE SHOW STEPS)</span>

4 0

3 years ago

Mateo bought 4.54 pounds of Fuji apples and 3.7 pounds of Golden Delicious apples.

katovenus [111]

0.84 more pounds of fuji apples than golden delicious apples.

7 0

3 years ago