When you do (7x)2, you square both numbers.
So 7 squared=49 and x squared=x2
Your answer should be 49x2
Let's try another example: 2(3xy)3
Now we cube each number in the parentheses. 2(33x3y3)=2(27x3y3)Finally you multiply the 2 and the 27. 54x3y3
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It equals 53X- a number is squared when it is multiplied by itself, so 7X by 7X = 49X. 2X by 2X =4X, so 49X + 4X is 53X.
Well, darling, the greatest common factor (GCF) of 14xy and 7x squared is 7x. Why? Because it's the largest number that can divide both terms without leaving a remainder. So, there you have it, 7x is the GCF, case closed.
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2x2 + 7x - 15 = (2x - 3)(x + 5)
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