Question 256493
<pre><font size = 4 color = "indigo"><b>
I am guessing it means

1.  Solve this equation:  {{{x^2=49}}}       

2.  Then substitute the solution(s) that you get
    into this expression {{{3(x-5)}}} and simplify.

-----------------------------

1.  {{{x^2=49}}}
    {{{x^2-49=0}}}
    {{{(x-7)(x+7)=0}}}
    
{{{x-7=0}}} gives the solution {{{x=7}}}
{{{x+7=0}}} gives the solution {{{x=-7}}}

2.  {{{3(x-5)}}}
    {{{3((7)-5)}}}
    {{{3(7-5)}}}
    {{{3(2)}}}
    {{{6}}}

    {{{3(x-5)}}}
    {{{3((-7)-5)}}}
    {{{3(-7-5)}}}
    {{{3(-12)}}}
    {{{-36}}}  

Edwin</pre>