Question

a³ -0.216 please tell me these​

Answer 1

Multiply that by A

So A(I + A + A^2) = AB

So A + A^2 + A^3(=0) = AB

So A + A^2 = AB

I + A + A^2 = B

So A + A^2 = B - I

So, B - I = AB

So (A - I)B = -I

So, B = -(A - I)^(-1)

Edit 1 : Marco Pereira has suggested a far simpler solution.

A + A^2 = AB. Multiply this by A^(-1) on both sides. So, A^(-1)A + A^(-1)*A^2 = A^(-1)*AB. So, I + A = B.

So, we get B = I + A.

Thank you for the suggestion!

825 viewsView 3 Upvoters · Answer requested by Akeel Hussain

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found it on google

Answer 2

if u see it clearly ,

$\sqrt[3]{0.216} = 0.6$

${a}^{3} - {(0.6)}^{3}$

using formula

${x}^{3} - {y}^{3} = (x - y)( {x}^{2} + {y}^{2} + xy)$

here,

$(a - 0.6)( {a}^{2} + 0.36 + 0.6a)$