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3 years ago

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

Mathematics

2 answers:

kramer3 years ago

3 0

Answer:

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

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

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Answer:

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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!

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Freeeee poooooooooooooooints!!!!

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Step-by-step explanation:

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