Question

please ans 6 the and 7th main

Answer 1

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Answer 2

Question 6: i) (2x+1) hole cube 3

using identity bracket (a + b) cube =a cube +b cube + 3 a b ( A + B)

(2x) power 3 + (1) power 3 +3×2x×1 (2× +1)

8x cube +1+12x square +6x

ii) (2a-3b)cube

= a cube -b cube -c cube
(2a) cube -(3b) cube - 3×2a×3b (2a-3b)
8a cube -27 b cube -36 a square b +54 Ab square answer ✅

question 7 i) (99) cube

(100-1) cube
( a- b) cube = a cube - b cube -3ab ( a- b)
(100) cube - (1) cube -3×100×1(a- b)
1000000-1-300(100-1)
999999-30000+300
10002999-30000
970299 answer ✅

ii) ( 102) cube
(100+2) cube
.. (a+b) cube = a cube + b cube + 3ab (a+b)
(100) cube + (2) cube + 3×100×2 (100+2)
1000000+8+600(100+2)
1000008+60000+1200
1061208 answer ✅

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