(x-y)²-4(x-y)- 45 factorise it
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let, (x-y) =a,
so, a^2-4a-45=a(a+9)-4(a+9)=(a-4)(a+9)
so, a^2-4a-45=a(a+9)-4(a+9)=(a-4)(a+9)
deepanarzari1128:
Are u sure about this ans !!!??
After finishing the ans...like at the last step can we change 'a' into 'x-y'...will it be correct..???
Is the last step correct!!!
yes
but sorry for late reply
It's fine...
Answered by
2
Answer:
Given (x - y)^2 - 4(x - y) - 45 can be written as
x^2 - 2xy - 4x + y^2 + 4y - 45
(x - y - 9) ( x - y + 5)
x - y = 9 (or) x - y = -5.Step-by-step explanation:
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