book Maths Puzzle Numerical Ability

would you pleas walk me threw this problem 3(1+4n)- 2(5n-3)=25

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book Other Question

What would you do to simplify a quadratic expression such as 5x^3-27x^2+58x+56? 1) Using the quadratic equation x2 - 3x + 2 = 0, perform the following tasks:
a) Solve by factoring.
Answer:
Show work in this space.

b) Solve by completing the squar