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solniwko [45]
3 years ago
10

64x​^2-81 what’s the answer ?

Mathematics
2 answers:
Virty [35]3 years ago
7 0

Answer:

(8x+9)(8x-9)

Step-by-step explanation:

64x^2= 8x*8x

-81= 9*-9

pychu [463]3 years ago
3 0

Answer:

(8x-9)(8x+9)

Step-by-step explanation:

64x^2 - 81

Rewriting

(8x)^2 - 9^2

We recognize that this is the difference of squares

a^2 - b^2 = (a-b)(a+b)

(8x-9)(8x+9)

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Morgarella [4.7K]

Answer:

z=2

Step-by-step explanation:

add 15 to both sides.

6z=-8z+28

add 8z to both sides.

14z=28

divide by 14 on both sides.

z=2

7 0
3 years ago
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3 years ago
Which is greater 5x10^2 or 2x10^5
aleksklad [387]

Answer:

2x10^5

Step-by-step explanation:

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7 0
3 years ago
If f(x) = 2x⁴- 3x² - 2x+5 and g(x)= x³ - 2x - 3, find the sum of polynomials f(x) and g(x) and hence state the order of the sum.
Finger [1]

Answer:

2x⁴ + x³ - 3x² - 4x + 2

4

Step-by-step explanation:

Given functions:

     f(x) = 2x⁴ - 3x² - 2x + 5

     g(x)  = x³ - 2x - 3

Unknown:

Sum of the polynomials = ?

Order of the sum  = ?

Solution:

The sum of the polynomial is expressed as;

    f(x) + g(x) = 2x⁴ - 3x² - 2x + 5 +  x³ - 2x - 3

                   = 2x⁴ + x³ - 3x² - 2x - 2x + 5 -3

                   = 2x⁴ + x³ - 3x² - 4x + 2

The order of the sum is the highest power which 4.

This polynomial is of the 4th order.

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3 years ago
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Answer:

Step-by-step explanation:

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