Answer:
12x^2 + 1xy -35y^2
Explanation:
12x^2 + 21xy -20xy -35y^2 becomes this simplified
(3x - 5y)(4x + 7y) =
3x × 4x + 3x × 7y - 5y × 4x - 5y × 7y =
12x² + 21xy - 20xy - 35y² =
12x² + xy - 35y²
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