exam Maths Puzzle Numerical Ability

Factor the following trinomial:

16x^2 + 40xy + 25y^2

I am still a little confused by this stuff. I hope that someone can help me understand????

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exam Other Question

Solve the equation (f o g)^-1(3).

Table providing values:

x 1 2 3 4 5
f(x) 5 3 5 1 2
g(x) 4 5 1 3 2

Thanks, John Write the verbal sentence as an equation.Then solve the equation

Ten plus 6 times a number is equal to 5 less than the number?

Can someone help with this equation?