Question

solve please if you are a math genious please​

Answer 1

Step-by-step explanation:

Given:

• a - b = 7
• ab = 18

To find:

• a³ - b³

Solution:

We know:

• (a - b)³ = a³ - b³ - 3ab(a - b)

We can write this as:

⇒ a³ - b³ = (a - b)³ - 3ab(a - b)

⇒ a³ - b³ = (7)³ - 3(18)(7)

⇒ a³ - b³ = 343 - 378

∴ a³ - b³ = -35

∴ The value of a³ - b³ = -35.

Answer 2

$\huge{♥}{\underline{\mathtt{\red{A}\pink{η}\green{s}\blue{ω}\purple{ε}\orange{я}}}}{♥}$

$\bf{( {a}^{3} \: \: - \: {b}^{3} ) \: = \: ( \: - 35)}$

$\huge{♥}{\underline{\mathtt{\red{E}\pink{x}\green{p}\pink{l}\blue{a}\purple{n}\orange{a}\green{t}\red{i}\pink{o}\purple{n}}}}{♥}$

$\bf{a \: — \: b \: = \: 7 \: , \: ab \: = \: 18 \: \: then \: \: {a}^{3} \: — \: {b}^{3} \: =}$

$\bf{a \: - \: b \: , \: 7}$

$\bf{ab \: = \:18}$

$\bf{{a}^{3} \: - \: {b}^{3} \: = \: ?}$

$\bf {{( \: a \: - \: b \: )}^{3} \: = \: {a}^{3} \: - \: {b}^{3} \: - \: 3ab \: ( \: a \: - \: b \: )}$

$\bf{ {a}^{3} \: - \: {b}^{3} \: = \: {( \: a \: - \: b \: )}^{3} \: - \: 3ab \: ( \: a \: - \: b \: ) }$

$\bf{ {a}^{3} \: - \: {b}^{3} \: = \: {( \: 7 \: )}^{3} \: 3 \: (18) \: (7) }$

$\bf{ = \: 343 \: - 378}$

$\bf{( {a}^{3} \: \: - \: {b}^{3} ) \: = \: ( \: - 35)}$

I hope it's helps you.

Please markerd as brainliest answer.