Use the following equation:
log2x + log2(x – 7) = 3

The third step would be to:
Select one:
a. Graph the function.
b. Take the log of each side.
c. Square the expression.
d. Factor the resulting quadratic equation.

Question

Use the following equation:
log2x + log2(x – 7) = 3

The third step would be to:
Select one:
a. Graph the function.
b. Take the log of each side.
c. Square the expression.
d. Factor the resulting quadratic equation.

jhonyy9 · Answer

do you know the properties of logarithm ?

jhonyy9 · Answer

so log a +log b = log (a*b)

jhonyy9 · Answer

so and 3 how you can rewrite it using log2 ?

jhonyy9 · Answer

3=log2 2^3 =log2 8

jhonyy9 · Answer

so than 

log2 x +log2 (x-7) =3

log2 (x(x-7)) = log2 8

ok ?

jhonyy9 · Answer

so 

x(x-7)=8

x^2 -7x -8 =0