All categories

3 years ago

Can anyone help me out here?

Mathematics

1 answer:

Leno4ka [110]3 years ago

8 0

${x}^{2} - x - 12$

Step-by-step explanation:

(x+3)(x-4)

1.) use distributive property

=x(x-4)+3(x-4)

=x^2-4x+3x-12

=x^2-x-12

You might be interested in

How to find the axis of symmetry -2(x - 4)^2 +2

Oksi-84 [34.3K]

Answer:

x=-2

Step-by-step explanation:

You need the standard formula

the standard formula will be

-2x²-8x+18

x=-b/2a

=-(-8)/2(-2)

=8/-4

=-2

7 0

3 years ago

Simplify sin θ / square root 1 - sin^2 θ

Soloha48 [4]

Recall that

$\cos^2\theta+\sin^2\theta=1$

which means

$\dfrac{\sin\theta}{\sqrt{1-\sin^2\theta}}=\dfrac{\sin\theta}{\sqrt{\cos^2\theta}}$

Now, $\cos\theta$ could be positive or negative, which means $\sqrt{\cos^2\theta}=|\cos\theta|$ . If we specifically knew the sign of $\cos\theta$ was positive, then we can simplify and write

$\dfrac{\sin\theta}{\sqrt{1-\sin^2\theta}}=\dfrac{\sin\theta}{\cos\theta}=\tan\theta$

or if it's negative,

$\dfrac{\sin\theta}{\sqrt{1-\sin^2\theta}}=\dfrac{\sin\theta}{-\cos\theta}=-\tan\theta$

7 0

3 years ago

Which number is a perfect square?

Kisachek [45]

Answer:

The answer is 144

Step-by-step explanation:

Because the square root of 12 is 144 making a whole number.

8 0

3 years ago

Thanks to some people who helped but I got a d from some of you guys.

denpristay [2]

oh no

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

Plz solve, find the area for each one, and plz show ur work or explain what u did

Serga [27]

The area of the trapezoid is

$S=\frac{h(a+b)}{2}$

1) $S=\frac{7(6,2+3,8)}{2} =\frac{70}{2} =35ft^2$

Answer: S=35ft²

2) $S=\frac{12,6(10,3+15,1)}{2} =\frac{320,04}{2} =160,02in^2$

Answer: S=160,02in²

3) $S=\frac{8,9(4,4+5,7)}{2} =\frac{89,89}{2} =44,945yd^2$

Answer: S=44,945yd²

P.S. Hello from Russia

7 0

3 years ago