Find the value of cos 14degrees . Round to the nearest ten-thousandth. A. 0.1367 B. 0.9703 C. 0.2419 D. 0.2493
2 answers:
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Answer:
<h2>x - any real number</h2>Step-by-step explanation:
Since the first part says the value is five less then twice the square of a negative number we get the first equation as 2(-x)²-5. Then we have that -9x is equal to that previous equation. Therefore our new equation is 2(-x)²-5=-9x. We can move the nine over by adding it to both side to get 2(-x)²+9x-5=0. Then you can use any method of factoring (I prefer quadratic formula) to get your values for x. By doing so, you’ll get x=28 and x=-32.5. Since the problem said the number was negative in the first part, you know you can’t have the 28 as the answer so the right answer is -32.5.
