(7a-b+3)-(-2a-8b+8)
Apply plus/minus rule.
-(-a)= a and -(a)=-a
we get
(7a-b+3)-(-2a-8b+8)= 7a-b+3+2a+8b-8
Add like terms
=9a+7b-5
Answer: 9a + 7b - 5
A)
5 – 12i = 3 + 2i
or, 3 – 2i
or, – 3 + 2i
or, – 3 – 2i
b)
3 + 4i is 2 + i
Recall the double angle identity,
sin(2x) = 2 sin(x) cos(x)
Then we can write
sin(9x) cos(9x) = 1/2 sin(2 • 9x) = 1/2 sin(18x)
Then
∫ sin(9x) cos(9x) dx
= 1/2 ∫ sin(18x) dx
= -1/2 • 1/18 cos(18x) + C
= -1/36 cos(18x) + C
though you could continue with another double angle identity,
cos(2x) = cos²(x) - sin²(x)
to rewrite the antiderivative as
= -1/36 (cos²(9x) - sin²(9x)) + C
= 1/36 (sin²(9x) - cos²(9x)) + C
Answer 4.6/5. 20
Step-by-step explanation: . lizcocch. Beginner. 2 answers. 11 people helped. The second expression, (16-8)x2+4, has a value of 20.
Answer:
2/5
Step-by-step explanation:
You could still divide by 2
