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3 years ago

Which expression is equivalent to 1/1-2sin^2(x)?

Mathematics

1 answer:

Alika [10]3 years ago

5 0

Answer:

a) $\frac{1}{cos(2x)}$

Step-by-step explanation:

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Please help me! ill mark brainliest

geniusboy [140]

Answer:

1. x=2 2. x-19/2 3. x=-2 4.=3

Step-by-step explanation:

5 0

3 years ago

Question 1- explain how Sheldon immediately knew howard was incorrect?

Dmitrij [34]

Answer:

Part 1) In the procedure

Part 2) In the procedure

Step-by-step explanation:

Part 1) Observing the graph

The roots are x=-1/2 and x=4

Remember that, the roots are the x-values when the value of y is equal to zero (the x-intercepts)

That's why Sheldon immediately realizes Howard's solution is incorrect

Part 2) we have

$y=2x^{2}-7x-4$

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

equate the equation to zero

$2x^{2}-7x-4=0$

$a=2\\b=-7\\c=-4$

substitute

$x=\frac{-(-7)(+/-)\sqrt{-7^{2}-4(2)(-4)}} {2(2)}$

$x=\frac{7(+/-)\sqrt{49+32}} {4}$

Howard's error is in this step, is wrong with the sign of the number 7, is positive instead of negative

$x=\frac{7(+/-)\sqrt{81}}{4}$

$x=\frac{7(+/-)9}{4}$

$x=\frac{7(+)9}{4}=4$

$x=\frac{7(-)9}{4}=-1/2$

4 0

3 years ago

Plssss helppppp!!!!!!!!!

Ira Lisetskai [31]

Answer:

it is two because one apple plus one apple equals two

it is 2

8 0

3 years ago

Read 2 more answers

The points (4, 9) and (0, 0) fall on a particular line. What is its equation in slope-intercept form?

Nikolay [14]

Answer:

The equation of the line would be y = 4/9x

Step-by-step explanation:

In order to find the equation, we first need to find the slope. We can do this by using the slope equation with the points.

m(slope) = (y2 - y1)/(x2 - x1)

m = (9 - 0)/(4 - 0)

m = 9/4

Now that we have this, we can use point-slope form along with one of the points to get the equation.

y - y1 = m(x -x1)

y - 0 = 4/9(x - 0)

y = 4/9x

5 0

3 years ago

Which number-line model represents the sum of 3/4 + ( - 1.75) ?

Fed [463]

Answer:

Step-by-step explanation:

6 0

3 years ago