Question

identities
(3x+4y) (3x-5y)
​

Answer 1

Answer:

(3x+4y)(3x+5y)

=[3x(3x+5y)]+[4y(3x+5y)]

=[3x(3x)+3x(5y)]+[4y(3x)+4y(5y)]

=(9x

2

+15xy)+(12xy+20y

2

)

=9x

2

+15xy+12xy+20y

2

=9x

2

+27xy+20y

2

Hence (3x+4y)(3x+5y)=9x

2

+27xy+20y

2

If you feel my answer is correct then..

• If you don't mind can we be friends
• plz follow me
• plz subscribe to my YouTube channel MEDICUS GNARITAS
• plz mark me as Brainlist

Answer 2

Answer:

${\small{\underline{{\color{red}{this \: question \: is \: based \: on \: \: {a}^{2} - {b}^{2} \: identity }}}}}$

${\huge{\underline{{\color{brown}{Answer \: is}}}}}$

$9{x}^{2} - 25 {y}^{2}$