exam Maths Puzzle Numerical Ability

Tutor Stan (15168) could you help me please? You previously showed me how to do this problem Find a linear functon g given g(-1/4)= -6 and g(2)=3
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exam Other Question
(4 sqrt s + 11 sqrt t)(4 sqrt s - 11 sqrt t)

To me, this is a difference of squares. How is the anser written?? (3x+5)²