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3 years ago

What is the value of this expression when x = -1 and y = -2?

Mathematics

2 answers:

Crank3 years ago

4 0

Answer:

-16

Step-by-step explanation:

4x³y²

4 × (-1)³ × (2)²

4 × -1 × 4

-16

PolarNik [594]3 years ago

4 0

Answer:

-16

Step-by-step explanation:

=4x^3y^2

=4(-1)^3(-2)^2

=-4*-1*4

=-4*4

=-16

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Answer:

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Step-by-step explanation:

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3 years ago

What's the explicit rule for the sequence 3, -6, 12, -24, 48, ...?

777dan777 [17]

Answer:

$\sf \dfrac{-3}{2}(-2)^n$

Step-by-step explanation:

Explicit formulas are used to represent all the terms of the geometric sequence with a single formula.

$\sf \boxed{\bf t_n = ar^{n-1}}$

a is the first term.

r is the common ratio.

r = second term ÷ first term.

3 , - 6 , 12, - 24, 48 ,........

a = 3

r = -6 ÷ 3 = -2

$\sf t_n = 3*(-2)^{(n-1)}\\\\$

$\sf = 3*(-2)^{n}*(-2)^{-1}\\\\ =3*(-2)^n*\dfrac{-1}{2}\\\\= \dfrac{-3}{2}(-2)^n$

Check:

$\sf t_1 =\dfrac{-3}{2}*(-2)^1=\dfrac{-3}{2}*(-2) = 3\\\\\\t-2 = \dfrac{-3}{2}*(-2)^2 = \dfrac{-3}{2}*4=-6\\\\\\t_3=\dfrac{-3}{2}*(-2)^3=\dfrac{-3}{2}*(-8)=12$

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2 years ago

Read 2 more answers

8x-4=2(4x-4) math question

EleoNora [17]

Answer:

No solution.

Step-by-step explanation:

8x - 4 = 2(4x - 4)

8x - 4 = 8x - 8

-4 = -8

-4 ≠ -8

8 0

3 years ago