Factorise it:
Please solve it step by stepppp....
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Step-by-step explanation:
a.9x^2 - y^2
= 9( x*x )- y*y
= 3×3(x×x) - y × y
b.121x^2 - 1/ y^2
= 11×11(x × x) - 1/(y×y)
c.15/a^2 - 60a^2
= 3×5/(a×a) - 3×3×3×3×3×3×3×3×3×3×3×3×3×3×3×3×3×3×3×3(a×a)
d.ab^3 - 9a^3 b
= a( b×b×b) - 3×3 (a×a×a)b
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