Question

verify that : 27 - 125a^3 - 135a + 225a^2 using identities for class 9th ​

Answer 1

Answer:

(3-5a) ^3 is the answer

Step-by-step explanation:

we have a identity

(a+b) ^3= a^3+b^3+3a^2b+3ab^2

Answer 2

Answer:

$we \: should \: use \: the \: identity \: ( {a - b})^{3}$

$({a - b})^{3} = {a}^{3} - {b}^{3} - 3( {a}^{2} b) + 3( a{b}^{2} )$

$= ( {5a}^{3} - {3}^{3} - 3( {5a}^{2} \times 3) + 3(5a \times {3}^{2})$

$= 125 {a}^{3} - 27 - 225 {a}^{2} + 135a$

$therefore$

$( {5a - 3}^{3} ) \: is \: the \: answer$

Step-by-step explanation:

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