exam Maths Puzzle Numerical Ability

I need to evaluate the function at the given expression, I need to find f (k-1) when f (x)=3x2-5x-4

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exam Other Question

Let n represent an even integer. Wright an expression for the following question.
What is the next even integer? Solve:

5[3(7-t)-4(8+2t)]-20<-6[2(6+3t)-4]

*the less than sign (<) is actually a less than or equal to sign but I didnt know how to make that on the computer. thank you