-7a-7b
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17a + 21a + 45 = 38a+ 45
3(7a - 5b) + 2(4a - 3b) Multiply the contents of each bracket by the number outside it: 21a - 15b + 8a - 6b Bring like terms together: 21a + 8a - 15b - 6b Combine like terms: 29a - 21b This cannot be simplified further.
a2(2a2-21a+49) a2(2a-7)(a-7)
The GCF is 7a.
It is: 21a exponent 6