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Brut [27]
3 years ago
9

6(a + 5) = 42 ...................................

Mathematics
1 answer:
Elan Coil [88]3 years ago
5 0
It’s 2 if I did my math right because I did it 2 tones and both of the times I got 2
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Solve 3x2 = −12x − 15.<br><br> x = −4 ± 2i<br> x = −4 ± i<br> x = −2 ± 2i<br> x = −2 ± i
diamong [38]
ANSWER

x = - 2 \pm i

EXPLANATION

We use the method of completing the squares.

The equation is
3 {x}^{2} = - 12x - 15

We rewrite the above equation to obtain;

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We divide through by 3 to obtain;

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We add half the coefficient of
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to both sides of the equation to get,

{x}^{2} + 4x + {2}^{2} = - 5 + {2}^{2}

The right hand side is now a perfect square.

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We now take square root of both sides to get;

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We add -2 to both sides,

x = - 2 \pm \sqrt{ - 1}

We simplify to obtain,

x = - 2 \pm i
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The solution is attached in the figure below.

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