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Anna71 [15]
3 years ago
13

the four highest scores on the floor exercise at a gymnastics meet were 9.675 9.25 9.325 and 9.5 points. choose the numbers that

make the statement true.
Mathematics
1 answer:
REY [17]3 years ago
6 0
Would it be 9.25 and 9.325
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The roots of the quadratic equation $z^2 + az + b = 0$ are $2 - 3i$ and $2 + 3i$. What is $a+b$?
AlladinOne [14]
We know for our problem that the zeroes of our quadratic equation are (2-3i) and (2+3i), which means that the solutions for our equation are x=2-3i and x=2+3i. We are going to use those solutions to express our quadratic equation in the form a x^{2} +bx+c; to do that we will use the <span>zero factor property in reverse:
</span>x=2-3i
x-2=-3i
x-2+3i=0
<span>
</span>x=2+3i
x-2=3i
x-2-3i=0
<span>
Now, we can multiply the left sides of our equations:
</span>(x-2+3i)(x-2-3i)= x^{2} -2x-3ix-2x+4+6i+3ix-6i-3^2i^2
<span>= </span>x^{2}-4x+4-9i^{2}
= x^{2} -4x+4+9
= x^{2} -4x+13
Now that we have our quadratic in the form a x^{2} +bx+c, we can infer that a=1 and b=-4; therefore, we can conclude that a+b=1+(-4)=1-4=-3.
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IM BEGGING SOMEONE!!! PLZ HELP IM SO CONFUSED
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SVETLANKA909090 [29]

Answer:

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Step-by-step explanation:


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Which of the following is correct?
Andru [333]

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none

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