3 years ago

X^(2)-4x-17=0 Please show work step by step

Mathematics

1 answer:

Dimas [21]3 years ago

7 0

Step-by-step explanation:

It seems here that they are asking us to solve for x

to do this we first need to factor

Since we can't factor this using the normal method we can instead do this

x^2 -4x-17=0

add 4 to both sides as it is a perfect square

x^2 - 4x + 4 = 17 +4

(x-2)^2 = sqrt 21

x-2 = ± 4.58

x -2 = 4.58 x-2 = -4.58

x= 6.58 x=-2.58

Or just say x=2+√21 or x=2−√21

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3 years ago

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How do you graph a circle x^2 + y^2=25 and the line is given y=2

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$\bf \textit{equation of a circle}\\\\ 
(x-{{ h}})^2+(y-{{ k}})^2={{ r}}^2
\qquad 
\begin{array}{lllll}
center\ (&{{ h}},&{{ k}})\qquad 
radius=&{{ r}}
\end{array}\\\\
-------------------------------\\\\
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and y = 2, is just a horizontal line, check the picture below.