Question

Write the following cubes in expanded form:
(i) (2x+1)
(ii) (2a - 3b)
7. Evaluate the following using suitable identities:
(i) (99)
(i) (102)
(iii) (998)
8. Factorise each of the following:
(1) 8a+b+12a+b + 6ab?
(ii) 8a-b?-12a+b+
(iii) 27 -125a' - 135a + 225a?
(iv) 64a - 275 - 1440
(v) 27p' - 2167 P P
9. Verify: (i).x + y = (x + y) (x2 - xy + y) (in) r-y' = (x - y) (r +
10. Factorise each of the following:
(i) 27y + 1252 (ii) 64m - 343n
[Hint : See Question 9.1​

Answer 1

Explanation:

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(2x+1)³

We know the formula,.

(a+b)³=a³-3a²b-3ab²-b³

So,

(2x)³-3.(2x)².(1)-3(2x).(1)²-(1)³

=8x³-12x²-6x-1

Hope it will help you

@ Sweety Adihya

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Answer 2

Answer:

(2x+1)³

We know the formula,.

(a+b)³=a³-3a²b-3ab²-b³

So,

(2x)³-3.(2x)².(1)-3(2x).(1)²-(1)³

=8x³-12x²-6x-1

Hope it will help you