Answer:43.98cm
Step-by-step explanation:
Answer:
Step-by-step explanation:
Easy way to do this is step by step. Your quadratic, from your entry, must be
.
Step by step looks like this, one thing at a time:
becomes
becomes
![x=\frac{3+\sqrt{9+20} }{10}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B3%2B%5Csqrt%7B9%2B20%7D%20%7D%7B10%7D)
and this of course is
![x=\frac{3+\sqrt{29} }{10}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B3%2B%5Csqrt%7B29%7D%20%7D%7B10%7D)
Do the same with the subtraction sign to get the other solution.
If you're unsure of how to enter it into your calculator, do it step by step so you don't mess up the sign. If you enter it incorrectly, you could end up with an imaginary number when it should be real, or a real one that should be imaginary.
Just my advice as a high school math teacher.
S^2 + s^2 = 9^2 => 2s^2 = 81 => s^2 = 81/2 => side length s = 9(sqrt(2))/2 = 6.37 cm.
The zeros of a function are the values of x that make the function be equal to zero.
When graphing a quadratic equation, the graph is a parabola, and the zeros of the function are the x-intercepts of the graph, which are the points where the graph intersects the x-axis.
So, if the zeros of this function are x = -8 and x = 2, that means the parabola crosses the x-axis at x = -8 and x = 2.
Therefore the correct option is the first one.