factorise please ............................
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1st.....4(x-y)(x-y-3)+9
just take x-y common from the 1st 2 terms..
2nd......(9(x+1))²+90(x+1)(y+2)+(5(y+2))²
(9(x+1)+5(y+2))²
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hope it will help u more...
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