Question

Ali was asked to factorise x^2y^2 + 36-4x^2-9y^2 .He tried some ways of grouping terms as shown below:
x^2y^2 + 36-4x^2-9y^2= (x^2y^2 + 36) - (4x^2+9y^2)
x^2y^2 + 36-4x^2-9y^2= (x^2y^2 + 36-4x^2)-9y^2
x^2y^2 + 36-4x^2-9y^2=x^2y^2 + (36-4x^2-9y^2)
As he could not carry out factorisation with the above groupings,he concluded that the expression could not be factorised.Do you agree with him? Why or why not?

Answer 1

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