40 because 3+6+12 = 21 and 8+11+21 =40
Answer:
Answer A) 25, and x+5
Step-by-step explanation:
You need to complete the square by adding a constant that makes the quadratic expression a perfect square of a binomial. So base your analysis on the fact that the coefficient accompanying the square term of x is one, and the fact that the middle term has coefficient 10 which is twice "5" so 5 is the likely candidate for the binomial that goes squared: (x + 5) and the square of 5 (25) is what you need to add as constant term to get the perfect square of a binomial:
![x^2+10x+25=(x+5)^2](https://tex.z-dn.net/?f=x%5E2%2B10x%2B25%3D%28x%2B5%29%5E2)
Whether you have to combine the two numbers together will be decided by you.
16’s reciprocal would be 0.0625
1/3’s reciprocal would be -3
Hope this helps and hope I am doing this right.