The cross method is a factorisation method used for quadratics.
Since the equation is in standard form ((aax2+x2+bbx+x+cc=0)=0) we can factorise using the cross method.
22x2x2-3−3xx+1+1=0=0
Find two numbers that multiply to 22 on the left side and multiply to 11 on the right side. Also, when cross multiplied they should add to the middle term (-3x−3x).
22 and 11 fit the condition for the left side and two -1−1’s fit the condition for the right side
The cross method is a factorisation method used for quadratics.
Since the equation is in standard form ((aax2+x2+bbx+x+cc=0)=0) we can factorise using the cross method.
33x2x2+2+2xx-21−21=0=0
Find two numbers that multiply to 33 on the left side and multiply to -21−21 on the right side. Also, the coefficients of xx in the factors, when multiplied by the constants, should add to 2x2x.
33 and 11 fit the condition for the left side and -7−7 and 33 fit the condition for the right side
The cross method is a factorisation method used for quadratics.
Since the equation is in standard form ((aax2+x2+bbx+x+cc=0)=0) we can factorise using the cross method.
-2−2x2-11x-12=0
Find two numbers that multiply to -2 on the left side and multiply to -12 on the right side. Also, the coefficients of x in the factors, when multiplied by the constants, should add to -11x.
-2 and 1 fit the condition for the left side and -3 and 4 fit the condition for the right side