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Can someone help with algebra x plus 4 x-4 parentheses before and after both x's and 4's?
(x + 4) (x - 4) = x2 - 16
To work this out you need to multiply each term in the first bracket by each term in the second bracket.
So you would do x times x which gives you x2.
Then x times -4 which is -4x.
Then 4 times x which 4x. (Note: this 4x will cancel out the -4x)
And finally 4 times -4 which is -16.
So you end up with x2 - 4x + 4x - 16 which equals x2 - 16.
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