multiply (7x^2 + 12xy − 9y^2) by (3x^2 − 5xy + 3y^2)
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4
(7x
2
+12xy−9y
2
)×(3x
2
−5xy+3y
2
)
=7x
2
(3x
2
−5xy+3y
2
)+12xy(3x
2
−5xy+3y
2
)−9y
2
)3x
2
−5xy+3y
2
)
=21x
4
−35x
3
y+21x
2
y
2
+36x
3
y−60x
2
y
2
+36xy
3
−27x
2
y
2
+45xy
3
−27y
4
=21x
4
−x
3
y+81xy
3
−66x
2
y
2
−27y
4
Step-by-step explanation:
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total answer of these question is answer 714
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