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3 years ago

If f(x) = 3x2 - x, find f(-2). 10 14 38

2 answers:

8 0

'Ello.

Just plug in the values.

f(-2) = 3(-2)^2 - (-2) {Equation}
f(-2) = 3(4) - (-2) {Multiply}
f(-2) = 12 - (-2) {The signs become a positive; add}
f(-2) = 14 {Answer}

You're welcome.

mojhsa [17]3 years ago

6 0

f(x) = 3x^2-x

F(-2)

replace x with -2

3(-2)^2 - -2 =

3*4 +2 = 14

Answer is 14

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3 years ago

−3y−4x=−11 3y−5x=−61

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3 years ago

Read 2 more answers

Which solution set describes the solutions to the inequality below?

Nuetrik [128]

<h2>Hello!</h2>

The answer is:

The sixth option,

[-6,6]

To solve the problem, we need to find which of the given options match with the solution to the inequality. As we know, solving inequalities is almost the same that solving equalities, we need to isolate the variable and then, find where it satisfies the given condition (inequality)

So, solving the inequality we have:

$-3x^{2} +1\leq -107\\-3x^{2}\leq -107-1\\-3x^{2} \leq -108\\3x^{2} \leq 108\\x^{2} \leq \frac{108}{3}\\\sqrt{x^{2} } \leq \sqrt{36}\\ x^{2\leq } +-36\\(x-6)(x+6)\leq 0$

Therefore, we have that the solutions to the inequality are:

First solution:

$x-6\leq 0\\x\leq 6$

Second solution:

$x+6\leq 0\\x\leq-6$

Hence, the correct option is the sixth option, the solution is described by the following solution set :

[-6,6]

Have a nice day!

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3 years ago