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3 years ago

Which of the following angles, when placed in standard position, does not land in quadrant III?

Mathematics

2 answers:

Romashka [77]3 years ago

8 0

your answer would be D,because i just had a quiz but if its not that it is deffenly B thanks for your time if d is right mark Brainliest.Thanks and have a great day.

Otrada [13]3 years ago

8 0

Answer:

C. 145°

Step-by-step explanation:

The values between 180 to 270 lie in the third quadrant.

And the value between -90 to -180 lies in the third quadrant.

Thus, 181°, -179°, and 97° does not lie in the third quadrant.

Only 145° lie in the third quadrant from the given options.

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Identify the terms. Identify the coefficients of the variable terms of the expression.

Tanzania [10]

The terms are the numbers separated by the subtraction signs.
The coefficients are $\sqrt{3}$ $5$

5 0

3 years ago

Which is an equation of the parabola that intersects the x-axis at points (-1, 0) and (3, 0)? Show your work or explain how you

hichkok12 [17]

Answer:

$\displaystyle \large{y=x^2-2x-3}$

Step-by-step explanation:

The given points are (-1,0) and (3,0) to find an equation of parabola. Notice that they say or the given points are x-intercepts, which means they make it easier for us to find an equation of parabola using these x-intercepts.

Quick Note:

x-intercepts are simply the roots or solutions of quadratic equation, so if our root is x = -2 then we can write as (-2,0) and write back to x+2=0.

So what we are going to do is to write the roots’ equation back as $\displaystyle \large{x+\alpha =0}$

Our points or roots are given, therefore:

If x = -1 then x+1=0

If x = 3 then x-3=0

Then multiply x+1 with x-3 because if (x-1)(x+3)=0 then x-1=0 or x+3=0:

$\displaystyle \large{(x+1)(x-3)=0}$

Convert 0 to y since we want to find a function:

$\displaystyle \large{(x+1)(x-3)=y}\\\displaystyle \large{y=(x+1)(x-3)}$

Expand the expressions in and simplify to standard form:

$\displaystyle \large{y=x^2-3x+x-3}\\\displaystyle \large{y=x^2-2x-3}$

Therefore, the equation is $\displaystyle \large{y=x^2-2x-3}$

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Summary

If we are given the points $\displaystyle \large{(\alpha ,0)}$ and $\displaystyle \large{(\beta ,0)}$ with wideness of the graph or a-value = 1 then the parabola equation is:

$\displaystyle \large{y=(x-\alpha )(x-\beta )}\\\displaystyle \large{y=x^2-\beta x-\alpha x+\alpha \beta }\\\displaystyle \large{y=x^2-(\beta +\alpha )x+\alpha \beta }$