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3 years ago

Help idk how to do help pls

Mathematics

1 answer:

Gwar [14]3 years ago

8 0

Answer:

Since the triangles are congruent, ∠B = ∠E by CPCTC which means:

2x + 31 = 7x - 24

55 = 5x

x = 11

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I NEED HELP PLS THIS IS DUE IN 3 HOURS

Mariulka [41]

Answer:

Part 1) $x^{2} -2x-2=(x-1-\sqrt{3})(x-1+\sqrt{3})$

Part 2) $x^{2} -6x+4=(x-3-\sqrt{5})(x-3+\sqrt{5})$

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

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

Part 1)

in this problem we have

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

$a=1\\b=-2\\c=-2$

substitute in the formula

$x=\frac{-(-2)(+/-)\sqrt{-2^{2}-4(1)(-2)}} {2(1)}\\\\x=\frac{2(+/-)\sqrt{12}} {2}\\\\x=\frac{2(+/-)2\sqrt{3}} {2}\\\\x_1=\frac{2(+)2\sqrt{3}} {2}=1+\sqrt{3}\\\\x_2=\frac{2(-)2\sqrt{3}} {2}=1-\sqrt{3}$

therefore

$x^{2} -2x-2=(x-(1+\sqrt{3}))(x-(1-\sqrt{3}))$

$x^{2} -2x-2=(x-1-\sqrt{3})(x-1+\sqrt{3})$

Part 2)

in this problem we have

$x^{2} -6x+4=0$

$a=1\\b=-6\\c=4$

substitute in the formula

$x=\frac{-(-6)(+/-)\sqrt{-6^{2}-4(1)(4)}} {2(1)}$

$x=\frac{6(+/-)\sqrt{20}} {2}$

$x=\frac{6(+/-)2\sqrt{5}} {2}$

$x_1=\frac{6(+)2\sqrt{5}}{2}=3+\sqrt{5}$

$x_2=\frac{6(-)2\sqrt{5}}{2}=3-\sqrt{5}$

therefore

$x^{2} -6x+4=(x-(3+\sqrt{5}))(x-(3-\sqrt{5}))$

$x^{2} -6x+4=(x-3-\sqrt{5})(x-3+\sqrt{5})$

5 0

3 years ago

Using the numbers 0, 1, 2, 2 1/2, 3, 7, 7 1/2, 9, and 10. find five numbers with the mean of 5.

Nataly_w [17]

10, 1, 5, 7, 2, is the answer to this problem
there are five numbers that mean 5

8 0

3 years ago

Which of the following equations is equivalent to 4[x + 2(3x - 7)] = 22x - 65

Nataly_w [17]

Answer:

See the equation simplified below.

Step-by-step explanation:

The equation simplifies to the following equations:

4[x + 2(3x - 7)] = 22x - 65

4[x+6x-14] = 22x - 65

4x+24x - 56 = 22x - 65

28x - 56 = 22x - 65

6x - 56 = -65

6x = -9

x = -3/2

7 0

4 years ago

This one is confusing, i thought it was 4 miles but its not an answer choice, can someone help?

Dmitrij [34]

Answer: the answer is about 10 because i got 10.8

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4 years ago

What is equivlent to 15x-20

Nana76 [90]

5(3x+4y) is equivalent to 15x-20 !

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3 years ago