Answer:
Step-by-step explanation:
-8(1 + 2x) - 2(x+6) = -8 - 16x - 2x - 12
= -18x - 20
First pick a value of

close to

. You should be fine with

.
The linear approximation of

at

is given by

where

is some fixed value close to

. You have

so



The actual value is closer to -0.9709, so the approximation is decent.
Answer:
-2.8
Step-by-step explanation:
1.4(2-4)
1.4(-2)
=-2.8
2nd degree with real coefients
so if a+bi is a root then a-bi is also a root
if 2+i is a root then 2-i is also a root
so, the factored form of a quadratic equation with roots r1 and r2 is
(x-r1)(x-r2)
so
2+i and 2-i
(x-(2+i))(x-(2-i))
(x-2-i)(x-2+i)
expanding we get
x²-4x+5
so c=5