FUNCTIONS TEST 1

1.   Given that $$f\left(x\right)=7x-1$$  

       Work out the values of  $$f\left(3\right).$$           

1.      Given that $$f\left(x\right)=\frac{5x+3}{7}$$   ,   find $$f\left(-9\right).$$  

1.   Given that $$g\left(x\right)=3x^2+4$$    

       Calculate   $$g\left(5\right).$$                        

1.   Let  $$h\left(x\right)=x^2+5x-1$$    

       Evaluate   $$h\left(-3\right)$$  .          

Given that  $$g\left(x\right)=3x-7$$  

Find the value of x for which $$g\left(x\right)=20.$$  

1.   Given that  $$f\left(x\right)=8-3x$$    

             Calculate x  when   $$f\left(x\right)=-4.$$   

1.   Given that  $$f\left(x\right)=\frac{8+x}{3}$$     

            Calculate x when  $$f\left(x\right)=5.$$  

1.   Given that  $$k\left(x\right)=\frac{2x+3}{5}$$   

               Calculate x when   $$k\left(x\right)=-3.$$  

Given  $$f\left(x\right)=2x+7\ \ and\ \ \ \ g\left(x\right)=5x-9$$  .

    Write down and simplify an expression for  $$fg\left(x\right).$$   

Given that $$j\left(x\right)=\frac{3}{x}$$  and $$k\left(x\right)=5x-4.$$  

Write down and simplify an expression for $$kj\left(x\right).$$