Expand :- ( 2x - 5y ) ³
Answers
- a = 2x
- b = 5y
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Answer:
\large\underline{ \underline{ \sf \maltese{ \: Question\: :- }}}
✠Question:−
\bf \: Expand:- \: ( \: 2x \: - \: 5y \: )^{3}Expand:−(2x−5y)
3
\begin{lgathered}\\ \\\end{lgathered}
\large\underline{ \underline{ \sf \maltese\green{ \: Identity \: Used:- }}}
✠IdentityUsed:−
\begin{lgathered}\underbrace\orange{\boxed{ \sf \blue{(a - b)^{3} \: = \: {a}^{3} \: - \: {b}^{3} \: - \: 3ab \: (a - b) }}}\\\end{lgathered}
(a−b)
3
=a
3
−b
3
−3ab(a−b)
\begin{lgathered}\\ \\\end{lgathered}
\large\underline{ \underline{ \sf \maltese\red{ \: Given:- }}}
✠Given:−
a = 2x
b = 5y
\begin{lgathered}\\ \\\end{lgathered}
\large\underline{ \underline{ \sf \maltese{ \: Solution:- }}}
✠Solution:−
\begin{lgathered}\qquad \quad {:} \longrightarrow \sf{\bf{ (2x - 5y)^{3} \: = \: {(2x)}^{3} \: - \: {(5y)}^{3} \: - \: 3(2x)(5y)\: (2x- 5y) }}\\\end{lgathered}
:⟶(2x−5y)
3
=(2x)
3
−(5y)
3
−3(2x)(5y)(2x−5y)
\begin{lgathered}\qquad \quad {:} \longrightarrow \sf{\sf{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \: {(8x)}^{3} \: - \: {(125y)}^{3} \: - \: 30xy\: (2x- 5y) }}\\\end{lgathered}
:⟶=(8x)
3
−(125y)
3
−30xy(2x−5y)
\begin{lgathered}\qquad \quad {:} \longrightarrow \sf{\sf{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \: {(8x)}^{3} \: - \: {(125y)}^{3} \: - \: 60 {x}^{2} y\: + \: 150x {y}^{2} }}\\\end{lgathered}
:⟶=(8x)
3
−(125y)
3
−60x
2
y+150xy
2
\begin{lgathered}\qquad \quad {:} \longrightarrow \sf{\bf{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \: {(8x)}^{3} \: - \: 60{x}^{2} y \: + \: 150 x {y}^{2} \: - \: 125 {y}^{3} }}\\\end{lgathered}
:⟶=(8x)
3
−60x
2
y+150xy
2
−125y
3
\begin{lgathered}\qquad\quad {:} \longrightarrow \underline \red{\boxed{\sf{ \: {(8x)}^{3} \: - \: 60{x}^{2} y \: + \: 150 x {y}^{2} \: - \: 125 {y}^{3} }}}\\\end{lgathered}
:⟶
(8x)
3
−60x
2
y+150xy
2
−125y
3
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More For Knowledge:-
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