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SIZIF [17.4K]
3 years ago
6

Part 1. Pick a two-digit number greater than 25. Rewrite your two-digit number as a difference of two numbers. Show how to use t

he identity (x − y)2 = x2 − 2xy + y2 to square your number without using a calculator.Part 2. Choose two values, a and b, each between 8 and 15. Show how to use the identity a3 + b3 = (a + b)(a2 − ab + b2) to calculate the sum of the cubes of your numbers without using a calculator.
Mathematics
1 answer:
ExtremeBDS [4]3 years ago
7 0

<u>S</u><u>o</u><u>l</u><u>u</u><u>t</u><u>i</u><u>o</u><u>n</u><u>:</u><u>-</u><u>1</u>

Number be 27

\\ \sf\longmapsto 27^2

\\ \sf\longmapsto (30-3)^2

\\ \sf\longmapsto 30^2-2(30)(3)+3^2

\\ \sf\longmapsto 900-180+9

\\ \sf\longmapsto 909-180

\\ \sf\longmapsto 729

\\ \sf\longmapsto 27^2

Hence verified

<u>S</u><u>o</u><u>l</u><u>u</u><u>t</u><u>i</u><u>o</u><u>n</u><u>:</u><u>-</u><u>2</u>

  • a be 10
  • b be 9

\\ \sf\longmapsto 10^3+9^3

\\ \sf\longmapsto (10+9)(10^2-10\times 9+9^2)

\\ \sf\longmapsto 19(100-90+81)

\\ \sf\longmapsto 19\times 91

\\ \sf\longmapsto 1729

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p=(180.50-19.50)/23

Step-by-step explanation:

3 0
3 years ago
Ayuda porfavor :b lo nesesito para hoy por fa
pishuonlain [190]

Answer:

a) x = 10

Step-by-step explanation:

En este romboide, el angulo A es igual a el angulo C, y el angulo ABC es igual a el angulo CDA.

Entonces, el angulo C es 7x.

En un triangulo, los angulos se suman para ser 180 degrados. En el triangulo BCE, hay un angulo recto.

7x + 2x + 90 = 180

7x + 2x = 90

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Espero que este te ayude!

4 0
4 years ago
When Ryan was born, he weighed 7 pounds.At 6 months, he weighed 11.2 pounds. Amanda weighed 6 pounds when she was born, and 12.9
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rayan

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because

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7 0
4 years ago
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On a field trip, there were 5 girls for every 8 boys how many girls attended the 130-student field trip?
Shtirlitz [24]

Answer:

5 / 13 is the fraction of girls on the field trip

5/13 * 130 = 50 girls on the trip

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3 0
3 years ago
If QR is 7 less than twice X, RS is 61 less than 5 times x, and QS is 11 more than x, find X and the measure of each side.
poizon [28]

Answer:

We can't find the answer unless there's the total amount of circumstances.

Step-by-step explanation:

QR= 2x-7

RS= x-61

QS= x+11

2x+7+x-61+x+11

? = 4x-43

4 0
3 years ago
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