book Maths Puzzle Numerical Ability

PLEASE-HELP
The technology and communication office of a local company has set up a new telephone system so that each employee has a separate telephone and extension number. They

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book Other Question

"solve for x"

1) 4x^2+12x+9=0
2) 7(x+2)^2=12
3) 2x^2-8x+5=0
4) (2x-5)/(x-3)=(4x+1)/(2x)

p.s. thanks
-5(-c+d)+6c-4d