(a)
(d) (a'2
(c) (3.5x - 1.5y)2-(1.5x - 3.5y)?
6. Find the value of 36x² + 49? - 84xy if x = 2, y = -2
life each of the following
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Answer:
ques no 6. 36x
2
+49y
2
+84xy
=(6x)
2
+(7y)
2
+2×6x×7y is of the form a
2
+b
2
+2ab
We have a
2
+b
2
+2ab=(a+b)
2
From above a=6x and b=7y
∴36x
2
+49y
2
+84xy=(6x+7y)
2
For x=3 and y=6 we have
(6×3+7×6)
2
=(18+42)
2
=60
2
=3600
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