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[null,null,"Solve these quadratic equations using the quadratic formula, rounding your answers to 2 decimal places where necessary"]
["* indicates a question that could be solved by factorising instead"]
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["Right-hand side equal to zero?",true,3,"",5,"b","²","+",6,"b","–",1,"=",0,null,"b","=",1.35,",",0.15,56,"",null,23,"",4,"x","²","+",20,"x","+",20,"=",0,null,"x","=",3.62,",",1.38,80,""]
["Allow negative values of a?",false,4,"",1,"m","²","+",9,"m","–",12,"=",0,null,"m","=",10.18,",",1.18,129,"",null,24,"",1,"r","²","–",4,"r","–",16,"=",0,null,"r","=",2.4700000000000002,",",6.47,80,""]
["Approximate percentage of questions with a=1",40,5,"",1,"n","²","+",6,"n","+",6,"=",0,null,"n","=",4.7300000000000004,",",1.27,12,"",null,25,"",3,"z","²","–",10,"z","–",3,"=",0,null,"z","=",0.28000000000000003,",",3.61,136,""]
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["(when answers are shown, the number in bold in brackets is the discriminant)",null,7,"",1,"p","²","+",9,"p","–",5,"=",0,null,"p","=",9.52,",",0.52,101,"",null,27,"",7,"z","²","+",1,"z","–",9,"=",0,null,"z","=",1.21,",",1.06,253,""]
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