a÷ b = 9÷5 find 2a^2 - b^3 ÷ 2a^2+b^3
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5
Answer:
2a−b−3c
Squaring, we get
=(2a−b−3c)
2
=(2a)
2
+(−b)
2
+(−3c)
2
+2(2a)(−b)+2(−b)(−3c)+2(−3c)(2a)
=4a
2
+b
2
+9c
2
−4ab+6bc−12ca
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