1) A(x) = (3+5x)² - (4x-7)(3+5x)
= 9 + 30x + 25x² - (4x-7)(3+5x)
= 9 + 30x + 25x² - 12x - 20x² + 21 + 35x
= 5x² + 53x + 30
2) A(x) = x (5x + 53) + 30
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1) A(x) = (3+5x)² - (4x-7)(3+5x)
= 9 + 30x + 25x² - (4x-7)(3+5x)
= 9 + 30x + 25x² - 12x - 20x² + 21 + 35x
= 5x² + 53x + 30
2) A(x) = x (5x + 53) + 30