2 * (7.5 * 5) + 2 * (2.3 * 5) + 2 * (2.3 * 7.5) =
75 + 23 + 17.25 =
115.25 cm²
c
Step-by-step explanation:
jdhdjejrbrbbrbrjdjejdjjshsh
Answer:
29.574
Step-by-step explanation:
Just a fact I learned in school!!!
First join the log4 on the left:
log4( x*(x-3) = log4(-7x+21)
Then x = -7, works: -7*(-10)=70 = -7*(-7)+21
x=-3, 18 = 42, does not work
x=3 0=0 works,
However, when one puts x = -7 in the *original* exression, log4(-7) or log4(-10) do not exist (you know why?). So x= -7 is extraneous.
Now x=3 gives log4(0) on the left and right, which does not exist.
So, C is the answer, both are extraneous. Seem to work but indeed don't work in the *original* equation
