Factorise the following expressions completely.
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1) 9y^{2 }– 25
=
2) p^{2 }– 64
=
3) 121 – y^{2}
=
4) 9x^{2 }– 36y^{2}
=
5) (x – 2)^{2 }– 49
=
6) 5a^{2 }– 45
=
7) b^{2 }– 25c^{2}
=
8)1 – 25a^{2}
=
9) a^{2 }– (b – c)^{2}
=
10) 2x^{2 }– 162
=