then find what 2 numbers multiply to get 100 and add to get 20
the numbers are 10 and 10
so split the center term up 100x^2+10x+10x+1 group (100x^2+10x)+(10x+1) undistribute (10x)(10x+1)+(1)(10x+1) undistribute/reverse distributive property (10x+1)(10x+1) (10x+1)^2
<span>since
this is a perfect square problem, the answer will be in the form (ax +
b) ^ 2. what can you tell from looking at the original equation? x^2
does not have a coefficient in front of it, so a = 1. the second term is
negative, so b must be negative. finally, the last number 100 is the
square of + or - 10, so b must be +10 or -10, but we already figured b
has to be negative, so b = -10 </span>
Temperature is the abiotic factor that is changing the ecosystem. Both the top layer temperature and the overall temperature of the lake are increasing. The warmer temperatures have delayed the yearly springtime mixing of warm and cold water in the lake.
