How do you verify factoring is correct?

1 answer:

5 0

Multiply the factors together. You should get the original expression.

For example, if we are to factor
2x^2 + 4x
we would factor as
2x(x + 2).
Check this by multiplying back in
2x*x + 2x*2 = 2x^2 + 4x
which is what we started with, so we know we are correct.

You might be interested in

What is (-2, -1) rotated 90 degrees clock wise

Savatey [412]

Answer:

(-1, 2)

Step-by-step explanation:

If we have a point (h,k) and it is rotated 90 degrees clockwise, the resulting point will have coordinates (k, -h).

So, basically the y coordinate becomes the x coordinate and x coordinate becomes the NEGATIVE of the y coordinate.

The point to rotate is (-2, -1), so after 90 degree clockwise rotation, it will become:

(-1, -(-2))

= (-1, 2)

This is the answer.

4 0

3 years ago

Which is a correct first step in solving 5 – 2x < 8x – 3?

lisabon 2012 [21]

Answer:

C. 5 < 10x - 3

Step-by-step explanation:

5 - 2x < 8x - 3

+2x +2x

5 < 10x - 3

:) ur welcome

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3 years ago

If the mean of a normally distributed population is -10 with a standard deviation of 2, what is the likelihood of obtaining a va

ira [324]

Answer:

93.32% probability of obtaining a value less than or equal to -7.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = -10, \sigma = 2$