Only when the discriminant of the quadratic expression is equal to or greater than zero
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Some expressions can't be factorised, and you have to use other methods to solve the equation.
108x2-102x+24 Simplified by dividing all terms by 6: 18x2-17x+4 When factorised: (9x-4)(2x-1) With a question like this using the quadratic equation formula will help.
Leave it the way it is. (by Stephen Hawking)
Yes FOIL method can be used with quadratic expressions and equations
The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)