exam Maths Puzzle Numerical Ability

Solve by completing the square.

4x^2 = 2x - 3 = 0

I have worked this problem three times now and can not figure it out. Could somebody please help me?????

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exam Other Question

this is very difficult for me, can you help?
Let f(x)=5x-6 and g(x)=x^2-8x+16. find the following:
1) (f+g)(x)
2) (g-f)(2)
3) (fg)(5)
4) f/g(x)

thanks so much! how do you solve a problem like, Y=3X-2 when -1<=X<=3,?