book Maths Puzzle Numerical Ability

(fg)inverse(x)

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equations in standard form

1.x^2-5x-14=0 2.x^2+x-2=0 3.x^2x-4=0

equations not in standard form

1.x^2+4x=-20 2.x^2-2x=99 3.x^2=14=10x

using the dicriminant
1.x^2-4x+10= Graph the line with slope 2 that passes through (1,2)