Percent means parts out of 100
80%=80/100=8/10=4/5
Answer:
The numbers are 5 and -4
Step-by-step explanation:
let the numbers be =x and y
x+y=1—eqn 1
x-y=9—eqn 2
Add both equations
2x=10
x=5
Plug x=5 into eqn 2
5-y=9
5-9=y
y=-4
a perfect square trinomial has a factor that is identical to the other factor. In this case, from the first term, the factor is composed of 2x while from the third term, there is a term 7 involved. In this case, the factor is 2x + 7. so the second term has to be 2*(2*7) equal to 28
