All categories

2 years ago

Evaluate 3x^2 - x for x = -2

Mathematics

1 answer:

Butoxors [25]2 years ago

4 0

Answer:

$3x^2 - x$

$3 \times - 2 \times - 2 - 2$

$(3 \times - 2 \times - 2) - ( - 2)$

$12 + 2 = 14$

You might be interested in

How to Increase 8 by 9.4%

Fed [463]

Answer:

75.2

Step-by-step explanation:

multiple 8 by 9.4

4 0

3 years ago

B\7+12=-8 helpppppppp

vodka [1.7K]

Answer:

b = -152

Step-by-step explanation:

7 + 12 = 19
Plug 19 in: $\frac{b}{19} = -8$
Multiply each side by 19 to cancel out the 19 under b. It should now look like this: b = -152

I hope this helps!

8 0

2 years ago

Jamie evaluated this expression. StartFraction left-bracket (2 cubed) (2) right-bracket Superscript 4 Baseline Over 2 Superscrip

SVETLANKA909090 [29]

Answer:

Step-by-step explanation:

Given the expression

$\frac{(2^3)(2)^4}{2^{10}} \\$

Using the following laws of indices;

$\frac{a^m}{a^n} = a^{m-n}\\a^m \times a^n = a^{m+n}$

The expression becomes;

Step 1: Multiplication rule

$=\frac{(2^3)(2)^4}{2^{10}} \\= \frac{2^{3+4}}{2^{10}}\\= \frac{2^7}{2^{10}}$

Using the division rule of exponent (Quotient of powers);

$= \frac{2^7}{2^{10}} \\= 2^{7-10}\\= 2^{-3}\\also \ a^{-m} = \frac{1}{a^m}\\ 2^{-3}= \frac{1}{2^3}\\\frac{1}{2^3} = \frac{1}{8}$

Hence the result of the expression is 1/8

5 0

3 years ago

Read 2 more answers

Answer these please

defon

Answer:

9: is answer 3

10: is answer 1

8 0

3 years ago

I need the answer and explanation to how you get the answer please, please, I’m giving 30 points...

12345 [234]

Step 1 = 3.9 × 0.5 + 4 5/6 ÷ 3 3/7
Step 2 = 3.9 × 0.5 + 29/6 ÷ 24/7
Step 3 = 4.4 + 29/6 × 24/7
Step 4 = 4.4 + 29/1 × 4/7
Step 5 = 4.4 + 111/7
Step 6 =44/10 + 111/7

Step one : Write the problem
Step two : Change the mixed numbers to improper fractions
Step three : Multiplication and Division should be done first. Then simplify.
Step four : Change the division to multiplication and multiply.
Step 6 : Add the remaining fractions

Sorry i didn't know which one so i did the first one. Hope it helps you.

8 0

3 years ago

Evaluate 3x^2 - x for x = -2​

Evaluate 3x^2 - x for x = -2