What number should be added to the expression x^2 + 6x to change it into a perfect square trinomal
1 answer:
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$6.63
Set up a proportion for the situation and solve for the unknown quantity. Round to the hundredths place because we are dealing with money.
See details:
Set up a proportion for the situation and solve for the unknown quantity. Round to the hundredths place because we are dealing with money.
See details:
Answer:
This is the answer of your question.
Answer:
7.7 km
Explanation:
Use cosine rule as here given two sides and one angle.
Cosine rule states:
a² = b² + c² - 2bc cos(A)
While solving, treat a = 7.5 km as to that opposite angle is given of 68°
then b = missing side, c = 5.2 km, A = 68°
Applying rule:
7.5² = b² + 5.2² - 2(b)(5.2) cos(68)
56.25 = b² + 27.04 - 3.8959b
56.25 - 27.04 = b² - 3.8959b
b² - 3.8959b = 29.21
b² - 3.8959b - 29.21 = 0
apply quadratic equation, Here [a = 1, b = - 3.8959, c = -29.21]
As length cannot be negative. Hence the value of b is only 7.7 km