exam Maths Puzzle Numerical Ability

Solve =

2x2(square) + 3 = 7x

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exam Other Question

decide whether lines p1 and p2 are perpendicular:

line p1:x+8y=-4
line p2:4x-2y=10 solve by using the square root property.

9x^2=14

and the other problem is

(x-5)^2=7