Yes.
Multiplying out the brackets on the second one:
4(n + 3) = 4×n + 4×3 = 4n + 12.
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The factors are 2n(4n + 3).
36/12 = 3 12/36 = 1/3
Fractions equivalent to 12 include 12/1, 24/2, 36/3, 48/4, and so on. These fractions are equivalent because they all represent the same value of 12 when simplified. Multiplying or dividing the numerator and denominator by the same non-zero number will result in an equivalent fraction.
1/3 + 3/4= (4 + 3)/12= 7/12
equivalent fractions of 2/3 = 4/6, 6/9, 8/12...