Website Statistics DM Factoriser B 5x 3 5x3 4 C 97x 1 au carré 16x au carré Help Urgent

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B= (5x + 3 ) (5x+3) - 4
=(5x+3)²-2²
=(5x+3-2)(5x+3+2)
=(5x+1)(5x+5)
=5(5x+1)(x+1)

C= 9(7x - 1 )² - 16x²
=[3(7x - 1 )]² - (4x)²
=(21x-3-4x)(21x-3+4x)
=(17x-3)(25x-3)

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