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Natasha2012 [34]
3 years ago
7

Expand the expression 5(m+2)

Mathematics
1 answer:
alekssr [168]3 years ago
7 0
5 x (m + 2)

Or if you are factoring, then you do this, 5 times m equals 5m + 5 times 2 which equals 10 so therefore you answer will be:

5m + 10
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Twice the sum of a number and 5 is equal to 20
satela [25.4K]

Answer:

15

Step-by-step explanation:

Sum means the result of an addition, so 20-5=15

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there are 3 slices of pie left, and the angle measurement is 72 degrees, how many slices was the pie cut in to
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7 0
3 years ago
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4.
zubka84 [21]

Answer:

See Explanation Below

Step-by-step explanation:

Given

(sin x - cos x)^2 = sec^2x - tan^2x - 2sinx.cos x.

Required

Prove

To start with; we open the bracket on the left hand side

(sin x - cos x)^2 = (sin x - cos x)(sin x - cos x)

(sin x - cos x)^2 = (sin x )(sin x - cos x)- (cos x)(sin x - cos x)

(sin x - cos x)^2 = sin^2 x -sinx cos x - sin xcos x + cos^2 x

(sin x - cos x)^2 = sin^2 x -2sinx cos x + cos^2 x

Reorder

(sin x - cos x)^2 = sin^2 x + cos^2 x - 2sinx cos x

From trigonometry;

sin^2x + cos^2x = 1

So;

(sin x - cos x)^2 = sin^2 x + cos^2 x - 2sinx cos x

becomes

(sin x - cos x)^2 = 1 - 2sinx cos x

Also from trigonometry;

sec^2x - tan^2x = 1

So,  

(sin x - cos x)^2 = 1 - 2sinx cos x

becomes

(sin x - cos x)^2 = sec^2x - tan^2x  - 2sinx cos x

Proved

3 0
3 years ago
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