Question

find the following products and verify the results for x= 1 and y=2 : (7xy + 4y²) × (3y² + 8x²)​

Answer 1

Step-by-step explanation:

=7×1×2+4×2×2×3×2×2+8×1×1

=872

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Answer 2

Answer:

21xy³+56x³y+12y⁴+32x²y²

Step-by-step explanation:

=7xy+(3y²+8x²)+4y²×(3y²+8x²)

=7xy+3y²+7xy×8x²+4y²×3y²+4y²×8x²

=21xy³+56x³y+12y⁴+32 x²y²

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