My teacher hasn't taught us this yet but it's gonna be on the test. can u please explain if u can

Mathematics

1 answer:

Hoochie [10]2 years ago

7 0

I don't like your teacher. not teaching something and putting it on the test. I hope that it is just that you weren't paying attention, or you were absent and not because you had a faulty teacher.

ok so from ABC to A"B"C" is down and to the left and it gets bigger

cross out an options that go up and right (cross out B&C)

it got bigger so the scale factor is not 1/2, it is 2

answer is D

You might be interested in

Jenny has 220 ounces of cleaning solution that she wants to divide equally among 12 large containers how much cleaning solution

stira [4]

18.33333333333333 fluid ounces each :)

8 0

3 years ago

Solve x2 - 8x - 9 = 0. Rewrite the equation so that it is of the form x2 + bx = c.

barxatty [35]

Answer:

x=9,-1 and $x^2+(-8)x=9$

Explanation:

we have been given with the quadratic equation $x^2-8x-9$

we compare the given quadratic equation with general quadratic equation

general quadratic is $ax^2+bx+c=0$

from given quadratic equation a=1,b= -8,c= -9

substituting these values in the formula for discriminant $D=b^{2}-4ac$

$D=(-8)^2-4(1)(-9)=100$

Now, to find the value of x

Formula is $x=\frac{-b\pm\sqrt{D}}{2a}$

Now, substituting the values we will get

$x=\frac{-(-8)\pm\sqrt{100}} {2}= \frac{8\pm10}{2}=9,-1$

And rewritting the given equation by shifting 9 to right hand side of the given equation and taking minus inside the bracket so as to convert it in the form of

$x^2+bx=c$