What's SOAP method?

Question

Need to solve x³+8 using SOAP method

Help me get an answer!

Answer 1

If you're to use Same Opposite Always Positive (SOAP) method, you need to use the following rule:

   a³ ± b³ = (a ± b) (a² (opposite sign) ab (always positive) b²)

So, the formula that is given x³+8 can be solved like this:

f(x + h) = 2(x + h) + 5

f(x + h) = 2x + 2h + 5

Therefore

f(x+h) - f(x) = 2x + 2h + 5 - 2x - 5 = 2h

[f(x+h) - f(x)]/h = 2h/h = 2