I just need #31 and #33 answered please.

Mathematics

1 answer:

sergiy2304 [10]3 years ago

5 0

<h2>31.f(x) ={3—x, x≤1</h2><h2> {2x, 1< x </h2><h2>= 3+1+2+1=7</h2><h2>= x+x+x =3x </h2><h2>= 3x+7=10x</h2><h2>= ×=30 </h2><h2>= ———</h2><h2> 10</h2><h2>= 3</h2><h2>now ,</h2><h2>3—x=3</h2><h2>x≤1=3×1=3</h2><h2>2x=1×3×1×3=9</h2><h2>1<x=9×3=27,,,,,,,, </h2><h2>how I have done do of all number </h2><h2>note:please understand and write </h2><h2 />

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Answer:

Option b which is $2x^2+6x+3=0$

Step-by-step explanation:

We have been given the discriminant 12

We have to choose the equation which will satisfy the given discriminant.

We will consider all the given equation one by one

First we will take option a which is $-x^2+8x+2=0$

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$D=b^2-4ac$

Here, a=-1,b=8 and c=2 on substituting the values we will get

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Hence, option b is correct

Therefore, option b is the required answer.

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$\bf \begin{array}{ccllll}
\textit{nautical miles}&kilometers\\
\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\\
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