exam Maths Puzzle Numerical Ability

solve each equation for x

x^2+4x+4=7
hint factor the left side

i am very confused by this

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exam Other Question

One pump can fill a water tank in 25 minutes. Another pump can fill the same tank in 50 minutes. If the first pump is open for 5 minutes before the second is opened, how long will it take to fill the tank? What is the equation of the line that passes through the point (1,5) and has a slope of -3?