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2 years ago

6a-4(2a+3) what is the answer HELP Thank you

Mathematics

1 answer:

hjlf2 years ago

3 0

Answer:

$\huge\boxed{\bf\:2 (-a - 6)}$

Step-by-step explanation:

$6a - 4(2a + 3)\\6a - (4*2a + 4*3)\\6a - (8a + 12)\\6a - 8a - 12\\- 2a - 12\\\boxed{\bf\:2 (-a - 6)}$

Steps:

Factorise the second term as the first is already in its simplified form.
Solve the first term and the second term by doing the required arithmetic operations.
Take the common factor out.
The result will be : 2 (- a - 6).

$\rule{150pt}{2pt}$

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Find the linear approximation of the function f(x, y, z) = x2 + y2 + z2 at (4, 4, 7) and use it to approximate the number 4.022

miss Akunina [59]

Answer:

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Step-by-step explanation:

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Since we have three variables,

$L(x, y,z) = f(a, b,c) + f_x (a, b,c) (x - a) + f_y (a, b,c) (y - b) +f_z(a,b,c)(z-c)$

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Therefore:

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3 years ago

5a - 24b =-15 10a + 45c =21 48b + 35c = 49

andrew-mc [135]

5a + 15 = 24b so,

10a + 30 = 48b,

sub to third equation,

10a + 30 + 35c = 49

10a + 35c = 19

perform elimination with second equation

10a + 45c = 21

10a + 35c = 19

________________-

10c = 2

c = 1/5

sub to second equation,

10a + (45)(1/5) = 21

10a + 9 = 21

10a = 12

a = 6/5

sub to first equation

(5)(6/5) - 24b = -15

6 + 15 = 24b

21 = 24b

b = 7/8

redo the calculations, correct me if I'm wrong

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3 years ago

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