Question

Multiply:

4x - 5y by 4x + 5y​

Answer 1

$\huge{\bold☘}\mathfrak\pink{\bold{\underline{{ ℘ɧεŋσɱεŋศɭ}}}}{\bold☘}$

$\huge\tt\red{\bold{\underline{\underline{❥Question᎓}}}}$Multiply:

4x - 5y by 4x + 5y

$\huge\tt{\boxed{\overbrace{\underbrace{\blue{Answer</p><p> }}}}}$

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Here ,we use this identity:-

$\boxed{({\red{x}} + {\blue{y}})({\red{x}} - {\blue{y}}) = {\red{x}}^{2} - {\blue{y}}^{2} }$

Now ,here x=4x & y = 5y

$\⟹(4x - 5y)(4x + 5y) = {(4x)}^{2} - {(5y)}^{2}$

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Answer 2

=(4x - 5y) × (4x + 5y)

=16x² + 20xy - 20xy - 25y²

=16x² - 25y²

=(4x)² - (5y)²