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Question

Question 8
15(y4)2(y9)+5(y+6)=0

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Solution

15(y4)2(y9)+5(y+6)=015y602y+18+5y+30=0
18y12=018y=12
y=1218y=23
To check:
15(y4)2(y9)+5(y+6)=015(234)2(239)+5(23+6)=0
15(2123)2(2273)+5(2+183)=0
15×1032×253+5×203=050+503+1003=0
50+50+1003=050+1503=0
50+50=00=0
L.H.S.=R.H.S
Therefore, it is correct.




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