exam Maths Puzzle Numerical Ability

I would appreciate any help with this problem.

Solve by completing the square
4x^2+2x-3=0

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exam Other Question

Multiply and simpplify. (Type exponential notations with positive exponents)

36c^2/5c^2 - 10c + 5 * 5c - 5/6c= if you osve this,can you please break down the steps and explain what to do because i dont know what to do when you 3 equations like these:

A=11B
A+x=5(B+x)
A+x+5=3(B+x+5)