Expand the following using identies
(5x+y)(5x-4y)
Answers
Answered by
6
Answer:
By using the identity= (x+a)(x+b)=x²+(a+b)x+ab
Step-by-step explanation:
(5x+y)(5x+(-4y))= 5x²+(y-4y)5x+y×(-4y)
= 25x²-20xy-4y²
Hope you understood!!!
(+)(-)=(-)
(-)(+)=(-)
okk
Answered by
3
IT IS OF THE FORM(x+a)(x+b)
THEREFORE,
(5x+y)(5x-4y)
=(5x)^2+(y-4y)5x+[y×(-4y)]
=25x^2+5xy-20xy-4y^2
=25x^2-4y^2-15xy
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