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Nezavi [6.7K]
2 years ago
12

Show that (3x+7)² -84x = (3x-7)​

Mathematics
1 answer:
Lapatulllka [165]2 years ago
7 0
First expand...

(3x+7)^2 = 9x^2+42x+49

Bring down -84x...

9x^2+42x+49-84x

Solve...

9x^2-42x+49

Factor...

(3x-7) (3x-7) = (3x-7)^2

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Rs = 8y + 4 , ST = 4y + 8 , and RT = 36 , find the value of y
Natasha_Volkova [10]
I assume that you meant RS and ST are segments of RT.  If that is true then:

RS+ST=RT, using the values for these given...

8y+4+4y+8=36  combine like terms on left side

12y+12=36  subtract 12 from both sides

12y=24  divide both sides by 12

y=2
4 0
3 years ago
What is the factored form of x^2 - 196 ?
Luba_88 [7]
D. (x-14)(x+14)
a negative and a positive multiplied makes a negative outcome so -14•+14=-196. x•x is = to x^2
8 0
3 years ago
Read 2 more answers
Would an experience downhill skier want the slope of the hill to be 1/10 or 9/10?  Why?<br><br>​
kolezko [41]

Answer:

9/10

Step-by-step explanation:

step 1

Compare the slopes

1/10=0.10

9/10=0.9

0.9 > 0.10

therefore

An experienced skier would like the 9/10 hill slope because it is steeper, while the 1/10 is a softer slope.

8 0
3 years ago
Suppose AB = 10 cm, BC = 9 cm, AC = 11 cm, DE = 11 cm, and DF = 9 cm. What else do you need to know to prove that the two triang
Makovka662 [10]
Two triangles must be congruent by SSS when their all sides would be equal.
So, BC = DF
AC = DE
Then, AB = EF = 10

In short, Your Answer would be Option B

Hope this helps!
8 0
3 years ago
A carton in the shape of a cube measuring 8 inches tall is filled with colored plastic cubes measuring 1 inch across each face.
Ksenya-84 [330]
Volume of a Cube = a³ ( a x a x a)
A = 8. 8³ = 8 x 8 x 8 = 512.
The cubes are one inch across so. 1 x 1 x 1 = 1.
512 x 0.25 = 128.
It would cost $128 to buy all the cubes.
Hope this helps!
5 0
2 years ago
Read 2 more answers
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