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William Bean
Mathematics
14 July, 04:12
Solve by factoring. x2 - 49 = 0
+1
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1
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Kellen Franco
14 July, 04:33
0
Remember
difference of 2 perfect squares
a^2-b^2 = (a-b) (a+b)
(x) ^2 - (7) ^2 = (x-7) (x+7)
set to zero
x-7=0
x=7
x+7=0
x=-7
x=-7 or 7
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