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3 years ago

Can someone help me with this :/

Mathematics

1 answer:

slavikrds [6]3 years ago

5 0

Answer:

2x² + x - 1 = 0

a= 2 b= 1 c= -1

x = [ -b +- sqr rt( b^2 -4ac) ] / 2*a

x = -1 +- sqr rt (1 - 4 *2*-1) / 4

x1 = [ -1 + (sqr rt (1 +8)) / 4

x1 = ( -1 + sqr rt (9)) / 4

x1 = (-1 + 3) / 4

x1 = .5

x2 = (-1 -3) / 4

x2 = -4 / 4

x2 = -1

And to check that answer: http://www.1728.org/quadratc.htm

Step-by-step explanation:

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3 years ago

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Answer:

**The equation is not clear, so I have provided both options**

<h3>Option 1</h3>

$\left|0.3-\dfrac{3}{5}k\right|-0.4=1.2$

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Solution 1

$\implies 0.3-\dfrac{3}{5}k=1.6$

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Solution 2

$\implies -(0.3-\dfrac{3}{5}k)=1.6$

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Answer:

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