Question

4. If (a + 36) = 6, show that a3 + 27 b³+ 54 ab = 216.
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Answer 1

Step-by-step explanation:

(a+3b) =6

cubing both sides we get

(a+3b) cube =6 cube

or , a cube +(3b) cube +3.a.3b (a+3b)=216

or, a cube+27b cube +

54ab=216__proved___