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Romashka-Z-Leto [24]
3 years ago
7

BRAINLIEST!!! +15 POINTS!!! REAL ANSWERS ONLY!!!

Mathematics
2 answers:
kramer3 years ago
3 0

Answer:

1.

Step-by-step explanation:

Yanka [14]3 years ago
3 0
The top one. Just get 1 to the left and plug into the quadratic formula
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Sergey is solving 5x2 + 20% – 7 = 0. Which steps could he use to solve the quadratic equation by completing the
Mrac [35]

Answer:

5(x^2+4x)=7

5(x^2+4x+4)=7+20

(x+2)=\pm\sqrt{\frac{27}{5}}

Step-by-step explanation:

we have

5x^2+20x-7=0

step 1

Group terms that contain the same variable, and move the constant to the opposite side of the equation

5x^2+20x=7

step 2

Factor 5 left side

5(x^2+4x)=7

step 3

Complete the square

5(x^2+4x+2^2)=7+2^2(5)

5(x^2+4x+4)=7+20

5(x^2+4x+4)=27

step 4

Rewrite as perfect squares

5(x+2)^2=27

step 5

(x+2)^2=\frac{27}{5}

(x+2)=\pm\sqrt{\frac{27}{5}}

(x+2)=\pm\frac{3\sqrt{15}}{5}

step 6

x=-2\pm\frac{3\sqrt{15}}{5}

6 0
3 years ago
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Which list shows the values of the weight changes
Alona [7]

Answer:

Speedy, Chloe, Annie, Pima, Piper

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3 years ago
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Find the sum of these polynomials
Nuetrik [128]
Hi there! The answer is B.

( {x}^{2}  - x + 7) + (9 {x}^{2}  + 6)
First we work out the parenthesis, which is easy because we can just remove them.

{x}^{2}  - x + 7 + 9 {x}^{2}  + 6
Now rearrange our expression (in order to collect terms later).

{x}^{2}  + 9 {x}^{2}  - x + 7 + 6
Next up is collecting the terms.

10 {x}^{2}  - x  + 13
The answer is B.

~ Hope this helps you!



7 0
3 years ago
Freeeee poooooooooooooooints!!!!
SpyIntel [72]

Answer:

yessiirrr

Step-by-step explanation:

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Answer:

true

Step-by-step explanation:

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