book Maths Puzzle Numerical Ability

I have no idea how to solve this question sqrt2y^2 - 3y - 10 = y can someone help me?

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Mr jones has a house nad a workshop that both stand 20ft. away from the main road. the two buildings are 20ft apart. the workshop is 20ft wide, 50ft deep and 30ft tall. the house i 3y5y-3

(x-3)(x2)(x-1)