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Lera25 [3.4K]
2 years ago
9

If f(x) = 4x² + +5 then, f(-2)

Mathematics
1 answer:
galben [10]2 years ago
5 0

Answer:

Step-by-step explanation:

equation is given as

fx=4x^{2} +5 if fx<em> is </em>f(-2) then we knew the vale of x which is -2\\ so we will substitute it in the equation as:

f(-2) = 4(-2)^{2} +5

solve:

-2f=4(4)+5\\-2f=16+5\\-2f=21\\\frac{-2f}{-2} =\frac{21}{-2}

f=\frac{21}{-2}

f=-10.5

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Answer:

<h2>7.4inches</h2>

Step-by-step explanation:

Check the attachment for the diagram. Sine rule will be used to get the unknown side of the triangle.

According to the rule;

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Given w = 3 in, ∠W=23° and ∠U=73°, on substituting into the equation above to get u we have;

\frac{u}{sin73^{0} } = \frac{3}{sin23^{0} }\\usin23^{0} = 3sin73^{0}\\u = \frac{3sin73^{0} }{sin23^{0} }\\u = \frac{2.87}{0.39} \\u = 7.358\\u = 7.4in

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