exam Maths Puzzle Numerical Ability

Solve the following equation for x.
2/5 = x - 2 /20

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exam Other Question

given f(x)=3x^2 - 5x + 2:
Find f(-4)

Find f(m+1) Find the square of (7p + 6q)^2

I need some help understanding how to find the square of these types of problems. Thanks.