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3 years ago

Need help!! Evaluate. - 3x ^ 3 - 4x for x = - 1 . 07 0-1

Mathematics

2 answers:

Lubov Fominskaja [6]3 years ago

6 0

Answer:

Step-by-step explanation:

$- {3x}^{3} - 4x$

[When x = -1 then]

$= - {3( - 1)}^{3} - 4( - 1)$

= - 3 × (-1) - 4 × (-1)

= 3 + 4

= 7 (Ans)

REY [17]3 years ago

4 0

Answer:

option A

Step-by-step explanation:

$p(x) = -3x^3 - 4x \\\\p(x = - 1 ) = -3( - 1)^3 - 4( - 1 )$

$= -3(-1) + 4 \\\\= 3 + 4 \\\\= 7$

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Answer:

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Step-by-step explanation:

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3 years ago

Read 2 more answers

Find the quadratic function that fits the following data. which one function fits.

Oksana_A [137]

Answer:

Step-by-step explanation:

The general rule for the quadratic function is

$y=ax^2+bx+c$

Use the data from the table:

$y(50)=130\Rightarrow 130=a\cdot 50^2+b\cdot 50+c\\ \\y(70)=130\Rightarrow 130=a\cdot 70^2+b\cdot 70+c\\ \\y(90)=200\Rightarrow 200=a\cdot 90^2+b\cdot 90+c$

We get the system of three equations:

$\left\{\begin{array}{l}2500a+50b+c=130\\ \\4900a+70b+c=130\\ \\8100a+90b+c=200\end{array}\right.$

Subtract these equations:

$\left\{\begin{array}{l}4900a+70b+c-2500a-50b-c=130-130\\ \\8100a+90b+c-2500a-50b-c=200-130\end{array}\right.\Rightarrow \left\{\begin{array}{l}2400a+20b=0\\ \\5600a+40b=70\end{array}\right.$