two negatives always equal a positive
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Plus or minus 7.
7 plus 7 divided by 7 plus 7 times 7 minus 7 is equal to 50.
if x^2 = 49, then the square root property says you can take the square root of both sides as long as you make one a plus-minus. x^2 = 49, which means square root of x^2 = plus minus the square root of 49 the square root of 49 is 7, so +- 7. We get: x = plus/minus 7 (this means either positive 7 or negative 7)
16x2 - 56x + 49 = (4x - 7)2
44