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3 years ago

I need to know the proper way to solve this

Mathematics

1 answer:

ahrayia [7]3 years ago

8 0

Divide both sides by -6:
$(u+5) ^{2} =-20
$
Then take the square root of both sides and subtract
5 $u=-5+i \sqrt{20}$

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Harman [31]

Answer:

A.

The student made an error in step 3 because a is positive in Quadrant IV; therefore,

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Step-by-step explanation:

Given

$P\ (a,b)$

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Required

Where and which error did the student make

Given that the angle is in the 4th quadrant;

The value of r is positive, a is positive but b is negative;

Hence;

$r = \sqrt{(a)^2 + (b)^2}$

Since a belongs to the x axis and b belongs to the y axis;

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Substitute $r = \sqrt{(a)^2 + (b)^2}$

$cos\theta = \frac{a}{\sqrt{(a)^2 + (b)^2}}$

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Rationalize the denominator

$cos\theta = \frac{a}{\sqrt{a^2 + b^2}} * \frac{\sqrt{a^2 + b^2}}{\sqrt{a^2 + b^2}}$

$cos\theta = \frac{a\sqrt{a^2 + b^2}}{a^2 + b^2}$

So, from the list of given options;

The student's mistake is that a is positive in quadrant iv and his error is in step 3

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Vedmedyk [2.9K]

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