Question

Factorise :81 − 625^2

Answer 1

Answer:

=81-625^2

=9^2-625^2 [use the identity a^2-b^2= (a+b)(a-b)]

= (9+625)(9-625)

= (9+625){3^2-25^2}

=(9+625)(3+25)(3-25)

= 634×28×(-22)

hope it helps you

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