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Book 4 of the 5 essential Ordinary Level Leaving Cert books will teach you how to recognise and solve the difference of 2 square and take something out of equations. -
Book 3 of the 5 essential Ordinary Level Leaving Cert books will introduce you to the concept of factors and teach you how to solve quadratic equations using factors. -
Book 2 of the 5 essential Ordinary Level Leaving Cert book will teach you how to recognise and solve both the standard and substitution simultaneous equations.
