Question

solve by using tables. give each answer to at most two decimal places.
-2x^2-4=-8
A. 0.59,3.41
B. -3.41,-0.59
C. 1.17, 6.83
D. -1.41,1.41

Answer 1

You can just use quadratic formula for this

Answer 2

but i dont understand how to do it :P

Answer 3

check your question again

Answer 4

i'm really not getting this :P

Answer 5

wait a sec

Answer 6

okie here we go.. we have equation
-2x^2-4=-8

now add +8 to both side what we get

-2x^2-4+8=-8+8
which is equal to

-2x^2+4=0

now take -2 as a common factor from above so we get

-2(x^2-2)=0
this gives

x^2-2=0
which is in turn

x^2=2

now taking square root of both sides we get

x=+or-sqrt(2) from tables you can find square root of 2 so ans is -1.41 or 1.41

Answer 7

thank you :)

Answer 8

you are most welcome..