All categories

3 years ago

What error did zacharias make?

Mathematics

2 answers:

meriva3 years ago

8 0

Answer:

The 2 in the numerator should be -2.

Step-by-step explanation:

We are given that a quadratic equation

-2x^2+5x-3=0

We have to find error made by Zacharias.

We have a=-2,b=5,c=-3

Quadratic formula : D=b^2-4ac

Substitute the values in the given formula

D=(5)^2-4(-2)(-3)

Therefore, the 2 in the numerator should be -2 .This is the error made by Zacharias.

qwelly [4]3 years ago

7 0

The equation 0 = -2x2 5x - 3 was the quadratic formula that Zacharias used. However, he started substituting as:
Quadratic formula as x = ; substitution as x

The errors he made: he mistakenly used the negative (-) and postive (+)
* -5 should have been 5
* 52 should have been -52
* both the numerator and the denominator should have been -2 instead of 2

You might be interested in

What is the ratio of 7/8

ch4aika [34]

Answer:

86.5%

Step-by-step explanation:

6 0

3 years ago

A new car's original price is $13,999. If it's on sale<br> for 10% off, what's the new price?

blsea [12.9K]

To find new price after discount we are going to find 10% of $13,999.00, then subtract the discount amount from $13,999.00.

13,999.00 × ¹⁰/₁₀₀ = $1,399.90

13,999.00 - 1,399.90 = $12,599.10

Therefore, new price = $12,599.10

8 0

3 years ago

A container ship has to make 2 deliveries then return to the pier it started from. The boat travels 8 miles straight north to it

oksano4ka [1.4K]

Straight north is the answer

6 0

3 years ago

An automobile manufacturer claims that its car has a 35.935.9 miles/gallon (MPG) rating. An independent testing firm has been co

Serjik [45]

<h2>Answer with explanation:</h2>

Let $\mu$ be the population mean.

For the given claim , we have

Null hypothesis : $H_0: \mu=35.9$

Alternative hypothesis : $H_a: \mu\neq35.9$

Since alternative hypothesis is two-tailed , so the test is a two-tailed test.

Given : Sample size : n=220 ;

Sample mean: $\overline{x}=35.6$ ;

Standard deviation: $s=2.2$

Test statistic for population mean:

$z=\dfrac{\overline{x}-\mu}{\dfrac{s}{\sqrt{n}}}$

$z=\dfrac{35.6-35.9}{\dfrac{2.2}{\sqrt{220}}}\approx-2.02$

By using the standard normal distribution table of z , we have

P-value ( two tailed test ) : $2P(Z>|z|)=2(1-P(Z$

$=2(1-P(z$

Since , the P-value is greater than the significance level of $\alpha=0.02$ , it means we do not have sufficient evidence to reject the null hypothesis.

5 0

4 years ago

What is 4.5 multiply 3.5

artcher [175]

Answer:

The answer for 4.5 to multiply 3.5 is 15.75

8 0

3 years ago

Read 2 more answers