I'm guessing that x2 is an x to the power of 2, so u can rewrite that as:
x^2 - x - 4
from there you can use completing the square, quadratic function, or factoring.
If the x2 is supposed to be 2x then it would just be as follows:
x - 4
Answer:
The original number is 17.
Step-by-step explanation:

Determine<span> whether a triangle with the given </span>lengths<span> is a </span>right triangle<span> or not. </span>Find<span> the </span>missing side<span> in each of the following </span>right triangles<span>. 2.</span>8 cm<span>, ') = 7 </span>cm<span> (</span><span>b) $% = 6 </span>cm<span>, %& = </span>8 cm<span>, $& = 10 </span>cm<span> (c) 34 = 17 </span>cm<span>, 45 = </span>8 cm<span>, 35 = </span>15 cm<span> 3.
</span>Use the Pythagorean Theorem to find<span> each </span>missing<span> measure. 1. 2. Example 1A</span>: Calculating theLength<span> of a </span>Side<span> of a </span>Right Triangle<span>. 12 </span>cm<span> , </span>82<span> + </span>152<span> = 17</span>2<span>.
</span>8.6.7, 8<span>.EE.2. When viewed from the </span>side<span>, the shape of some wooden waterskiing ramps is a, So, the hypotenuse is </span>15<span> inches long. Check: 02 + Write an equation you could use to </span>find<span> the length of the </span>missing side<span> of 20 </span>cm<span>. 18 yd lf the </span>sides<span> of a </span>triangle<span> have </span>lengths<span> 0,13, and c units such that 02 + is)2 = C 2</span>
The scale factor of a dilation in which the original polygon and its dilated image are congruent is 1.0. If the scale factor is greater than 1, the image is in enlargement. I hope my answer has come to your help. God bless and have a nice day ahead!