Answer:
Step-by-step explanation:
If the question is to factorize
![x^4-17x^2+16\\\\x^4-x^2-16x^2+16\\\\=x^2(x^2-1)-16(x^2-1)\\\\=(x^2-1)(x^2-16)\\\\=(x+1)(x-1)(x-4)(x+4)\\](https://tex.z-dn.net/?f=x%5E4-17x%5E2%2B16%5C%5C%5C%5Cx%5E4-x%5E2-16x%5E2%2B16%5C%5C%5C%5C%3Dx%5E2%28x%5E2-1%29-16%28x%5E2-1%29%5C%5C%5C%5C%3D%28x%5E2-1%29%28x%5E2-16%29%5C%5C%5C%5C%3D%28x%2B1%29%28x-1%29%28x-4%29%28x%2B4%29%5C%5C)
Change the percent to a decimal then multiply
.39(71)=27.69
Answer: 100.
Justification.
A perfect square is a number that can be expressed and the square of an integer.
In this case, 10^2 = 100, so 100 is a perfect square.
It is a good idea to memorize the first perfect squares. I recommend you memorize the squares of the numbers from 1 to 14. That will help you a lot in some standardized tests,which requires to answer some quesitons fast: