Question

if a =3+b find the value of
${a}^{3} - {b}^{3} - 9ab$


plz plz solve it

Answer 1

hello Frnd

Here is your answer ...


Given that

a = 3 + b

We need to find

${a}^{3} - {b}^{3} - 9ab$
putting a = 3 + b in above equation; we get

$> > > ( {3 + b})^{3} - {b}^{3} - 9ab \\ \\ by \: using \: ({a + b})^{3} = {a}^{3} + {b}^{3} + 3 {a}^{2} {b} + 3 {a} {b}^{2}$

$> > 27 + {b}^{3} + 27b + 9 {b}^{2} - {b}^{3} - 9ab \\ > > > 27 + 27b - 9ab \\ > > 3 + 3b - ab$



hope it helps
jerri

Answer 2

Answer:

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