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Quadratic equations can be written in the form ax2 + bx+ c= O where a,b and c are numbers.
Step-by-step explanation:
if a quadratic equation is given in a different form you should rearrange it before solving it. If you can factorise the left hand side of quadratic equation , you can solve it without a calculator.
For a reminder about factorising quadratic expression you need to look for the largest factor you can take out of every term in the expression.