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ASHA 777 [7]
3 years ago
9

HELP!! 100 POINTS!!

Mathematics
2 answers:
NNADVOKAT [17]3 years ago
5 0

Answer:

x=9 x=-1

Step-by-step explanation:

x²-8x-9=0    a=1 b=-8 c=-9

you have to use the quadratic formula to get the values.

Sladkaya [172]3 years ago
3 0

Answer:

It's incorrect

x = -1, 9

Step-by-step explanation:

x²-8x-9=0

x²-8x=9

x²-8x+16=9+16

(x-4)²=25

You have to take square root both sides, so RHS would be sqrt(25) = 5 (+/-)

x-4=+/-5

x-4=5

x-4=-5

x=9

x=-1

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1- find the first term= ?, 90, 540, 3240
Luda [366]

Answer:

1. 15

2. 8

Step-by-step explanation:

The two sequence are geometric progression GP, because they follow a constant multiple (common ratio)

The nth term of a GP is;

Tn = ar^(n-1)

Where;

a = first term

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For the first sequence;

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r = T3/T2 = 540/90 = 6

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Substituting the values of r;

90 = a × 6

a = 90/6

a = 15

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2. The sam method applies here.

Common ratio r = T3/T2 = 128/32 = 4

r = 4

T2 = ar^(2-1) = ar

T2 = 32 = ar

Substituting the values of r;

32 = a × 4

a = 32/4

a = 8

First term = 8

4 0
3 years ago
A group of point that lie on the same plane are called
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Hey There!

Answer Coplanar Points

The term to describe a group of points that lie on the same plane are called.

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If the points were to lie on the same line, the term to describe this would be called.

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