Solve x² + x -12

So to begin we need factors of 12.

12 and 1, 3 and 4.

Then we need to think of a way of adding or subtracting to give -1.

So we can have 4 and -3.

which gives (x+4)(x-3).

So x= -4 or x=3

Answered by Param B. Maths tutor

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