Answer:
the exprrssions are equivalent to 4( x-1)
Number 1 is B b/c is u count backwards 5 u get b
The x-intercept is the point where the graph intersects the y-axis.
At the y-axis, all points have 0 for the y-coordinate.
Let y = 0, and solve for x.
y = 2x - 10
0 = 2x - 10
10 = 2x
5 = x
x = 5
The x-intercept is 5.
Using logarithmic laws: log(a) + log(b) = log(ab)
log₄ (x + 9) + log₄ (x + 21) = log₄ [(x + 9)(x + 21)] = 3
Since we want the equation in terms of x, the next intuitive step is take 4 to the power of both sides, because the left hand side will simplify easily.



Solving the quadratic we get:



BUT, for the logarithmic equation to be defined, x > -9, so x≠ -25
Thus, the only solution is x = -5.