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nekit [7.7K]
3 years ago
15

The length of a rectangle is 4 more than its width. The area of the rectangle is 21m^2 . What is the measure of the width?

Mathematics
1 answer:
saw5 [17]3 years ago
5 0
Make the length x+4 and the width x  and then make a formula x(x+4)=21
then u ll get x^2+4x-21=0  and then solve for x ..... the width is 3 

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Step-by-step explanation:

al nth term:

numerator:

=  {n}^{2}

denominator:

= n + 1

so nth term :

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b). 1; 11; 27; 49

first difference: 10; 16; 22

second difference :6

formula for 1st difference:3a+b

formula for 2nd difference:2a

Therefore:

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sub in a

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sub into quadratic formula

{an}^{2}  + bn  + c

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So Tn:

3 {n }^{2}  +  1n - 3

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