exam Maths Puzzle Numerical Ability

-20-3x+3x^2=0

I know that the trinomial cannot be factored, but is there another way to solve the equation?

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exam Other Question
If f(x)=2x+5 and g(x)=3x2-1 find the value of f(b2) find (f of g)(7)



x 4 5 6 7 x 4 5 6 7
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f(x) 6 7 4 5 g(x) 6 5 7 4