00:01
In this question, we are given a function f and a point x.
00:05
And first, we are asked to calculate f of x plus h.
00:11
To calculate f of x plus h, we simply need to replace x by x plus h in the formula for f.
00:19
And what we are going to get is 1 over 4 times x plus h, replaced x by x plus h, plus 1.
00:29
So this is a formula for f of x plus h.
00:31
Now let's calculate the difference f of x plus h minus f of x.
00:41
This equals to 1 over 4 times x plus h plus 1 minus 1 over 4x plus 1.
00:55
Now let's simplify this expression.
01:13
So we need to bring this expression to the common denominator.
01:16
And to do that, we need to multiply the first fraction by 4x plus 1 and the second fraction by 4 times.
01:27
X plus h plus 1 and we are going to get 4x plus 1 minus 4 times x plus h plus 1 all of this is in parentheses divided by 4 times x plus h plus 1 multiplied by 4x plus 1 and this simplifies to 4x plus 1 minus 4x plus 1 plus 1 over the denominator.
02:24
Next, we can cancel, we can cancel 4x and we can cancel one.
02:29
And after cancellations, we're going to get negative 4h divided by 4x plus h plus 1 times 4x plus 1...