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rosijanka [135]
3 years ago
15

HELP I DON'T UNDERSTAND

Mathematics
1 answer:
miv72 [106K]3 years ago
8 0
X^2 - 12x  = 61
Take half of the coefficient of the middle term (half of -12x), square this result, and then add, and then subtract, from -12x:

x^2 - 12x + (6)^2 - (6)^2     = 61

    (x-6)^2 - 36 = 61, and so   (x-6)^2 = 97

Note:  These results are all equivalent; choose the one you think best.
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