Bonjour
A = 16y^2 -25
B = x^2 + 4x +4 -(9x^2 -30x + 25)
B = x^2 + 4x +4 -9x^2 + 30 x -25
B = -8x^2 + 34x -21
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Bonjour
A = 16y^2 -25
B = x^2 + 4x +4 -(9x^2 -30x + 25)
B = x^2 + 4x +4 -9x^2 + 30 x -25
B = -8x^2 + 34x -21