book Maths Puzzle Numerical Ability

When i worked this problem, the graph did not turn out right. The equation is xsquared-5x+6=0. I have to solve the equation by graphing. could you please help me out?

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book Other Question

Explain the process and show EACH step in the process of simplifying the following problems:
a. sqrt(48m^5/81)
b. sqrt50 + sqrt32 - 2(sqrt8)
c. 3(sqrt12) - 5(sqrt48)
log(2+x)-log(x-2)=log(5)