3 years ago

Cents 140 3 Minutes 3 1 1

Mathematics

2 answers:

coldgirl [10]3 years ago

5 0

Answer:

Step-by-step explanation:

PLS GIVE BRAINLIEST

Lerok [7]3 years ago

4 0

Answer:

Step-by-step explanation:

PLEASE GIVE ME BRAINLEIST

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irakobra [83]

1. $x^2-x-72=0$
$\Delta=(-1)^2-4*1*(-72)=1+288=289$
$\sqrt{\Delta}=17$
$x_1=\frac{1-17}{2}=-8$
$x_2=\frac{1+17}{2}=9$

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$\sqrt{\Delta}=8$
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$x_2=\frac{-12+8}{2}=-2$

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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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