16x2 - 49 = 42x2 - 72 = (4x)2 - 72 = (4x - 7)(4x + 7)
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It is: 7 times 7 equals 49
49 x 7
If that's 16x2 + 72x + 81, that factors to (4x + 9)(4x + 9) or (4x + 9)2
Yes, and this is how. 16 x 2 - 9 16x2=32, 32 - 9 =23, so 23 is your answer! Good Question!
49 does not go into 189 evenly. 189 divided by 49 equals 3 with a remainder of 42.