What is the smallest positive number that can be added to 55 so that the resulting number and 45 have 9 as their greatest common
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From formula a^2-b^2 = (a-b)(a+b) :
x^2 - 16 = (x-4)(x+4)
In 2x+8 factor out "2", you'll reach 2(x+4). So:
(In finish you delete 8(x+4) from nominator and denominator)
x^2 - 16 = (x-4)(x+4)
In 2x+8 factor out "2", you'll reach 2(x+4). So:
(In finish you delete 8(x+4) from nominator and denominator)