Factoriser : E = 4x² - 1
F= (2x+1)(x+7) + (x-1)(x+7)
G= (2x + 1 )² - (3x-1)(2x + 1 )
H = 2x^3 + 5x²
I = ( x-1)² - (2x-3)²
J= 4x² -12x +9
K = (4x+3)(x-1) + 4x +3
L= 5 - x + (x-5)(2x+1)
F= (2x+1)(x+7) + (x-1)(x+7)
G= (2x + 1 )² - (3x-1)(2x + 1 )
H = 2x^3 + 5x²
I = ( x-1)² - (2x-3)²
J= 4x² -12x +9
K = (4x+3)(x-1) + 4x +3
L= 5 - x + (x-5)(2x+1)
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