42.
7x6 21x2 14x3 10.5x4 8.4x5
42 + 21 x 2 = 84
42 = 2 × 3 × 7
Its 42 (2x21)=42 (7x6)=42 (21x2)=42
No, 21 is not prime.
No, 2 x 3 x 7 = 42
40-42+5 -2+5 3 3 is the answer
y = 3x + 21x2 = 3x(1 + 7x)
8t equals -42 = -34
42 x 42 = 1764 42 + 42 = 84
you are almost there, you must split it one more time. 21 is divisible by 7 and 3, so the prime factorization of 42 is 7x3x2