Factorise the following:-
a^2-ab-20b^2
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Step-by-step explanation:
The equation a
3
+a
2
b+ab+b
2
can be factorised as follows:
a
3
+a
2
b+ab+b
2
=(a
3
+a
2
b)+(ab+b
2
)=a
2
(a+b)+b(a+b)=(a
2
+b)(a+b)
Hence, a
3
+a
2
b+ab+b
2
=(a
2
+b)(a+b)
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