You mean "completing the square," don't you? ;)
<span>(x+7)(x-9)=25 can be expanded: x^2 - 9x + 7x - 63 + 25, which becomes
x^2 -2x = 38.
Let's now complete the square:
x^2 - 2x + (1)^2 - (1)^2 = 38, or x^2 - 2x + 1 = 39
Rewrite that as (x-1)^2 = 39
Take the sqrt of both sides: x-1 = plus or minus sqrt(39)
Write the roots: x = 1+sqrt(39) and x = 1 = sqrt(39) (answers)</span>
Answer:
Step-by-step explanation:
He traveled at 60 mph a distance of 60*hours.
He traveled at 40 mph the same distance of 40(15 hrs - time hrs). The distance is the same; therefore, set them equal.
60t = 40(15-t)
60t = 600 - 40t
100t = 600
t = 6 hrs for the 60 mph day.
15-t = 9 hours for the 40 mph day.
distance = 6 h x 60 mph = 360 miles.
distance = 9 h x 40 mph = 360 miles.
Answer:
y=7x+1
Step-by-step explanation:
y-y1=m(x-x1)
y-8=7(x-1)
y-8=7x-7
y=7x-7+8
y=7x+1
Answer:
700 is your answer I think I'm not good at math so if it is wrong sorry