Christmas MT's answer to lana <3's Secondary 3 A Maths Singapore question.

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Christmas MT
Christmas Mt's answer
2912 answers (A Helpful Person)
its a very similar question to the other 3, x^2-18 is still in the format of ax^2 + bx + c, you just need to see that b=0 in this case. it is still a quadratic eqn.