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melamori03 [73]
3 years ago
9

How do I prepare and solve problems like this?

Mathematics
1 answer:
Kamila [148]3 years ago
8 0

Answer:

..

Step-by-step explanation:

You could find out how much each letter equals then maybe times then together or add the.

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Factorise : x^2+x-72 Step by Step​
Ivan

Answer:

(x + 9)(x - 8)

Step-by-step explanation:

f(x) = x^2 + x - 72

     = x^2 - 8x + 9x - 72

     = (x^2 - 8x) + (9x - 72)

     = x(x - 8) + 9(x - 8)

     = (x + 9)(x - 8)

4 0
3 years ago
Read 2 more answers
Find constants a and b such that the function y = a sin(x) + b cos(x) satisfies the differential equation y'' + y' − 7y = sin(x)
Elza [17]
The first thing we must do in this case is find the derivatives:
 y = a sin (x) + b cos (x)
 y '= a cos (x) - b sin (x)
 y '' = -a sin (x) - b cos (x)
 Substituting the values:
 (-a sin (x) - b cos (x)) + (a cos (x) - b sin (x)) - 7 (a sin (x) + b cos (x)) = sin (x)
 We rewrite:
 (-a sin (x) - b cos (x)) + (a cos (x) - b sin (x)) - 7 (a sin (x) + b cos (x)) = sin (x)
 sin (x) * (- a-b-7a) + cos (x) * (- b + a-7b) = sin (x)
 sin (x) * (- b-8a) + cos (x) * (a-8b) = sin (x)
 From here we get the system:
 -b-8a = 1
 a-8b = 0
 Whose solution is:
 a = -8 / 65
 b = -1 / 65
 Answer:
 
constants a and b are:
 
a = -8 / 65
 
b = -1 / 65
4 0
3 years ago
HURRY PLEASE!!!!
Nitella [24]

Answer:

130

Step-by-step explanation:

3 0
3 years ago
Which of these is a factor in this expression?
NikAS [45]

Answer:

answer C

Step-by-step explanation:

8 0
2 years ago
Read 2 more answers
NEED HELP ASAP!
LUCKY_DIMON [66]
I think it is A but I'm not really sure
6 0
3 years ago
Read 2 more answers
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