Replacing 'a'

Algebra Level 1

Find the value of the following expression if a = 0.5 a = 0.5 :

( 2 a ) 2 + 7 a 2 (2a)^2 + 7a^2


The answer is 2.75.

Scarlett Red by Scarlett Red , 20, Canada

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5 solutions

. .
Feb 20, 2021

a = 0.5 , ( 2 a ) 2 + 7 a 2 = 1 + 1.75 = 2.75 a = 0.5, (2a)^{2} + 7a^2 = 1 + 1.75 = \boxed { 2.75 } .

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Rishabh Jain
Mar 12, 2019

Square the first term will give us 4a^2 ,then add with 7a^2 will result 11a^2 ,and the value of a^2 is .25 , so final ans is 11×0.250=2.750

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Vishal Barman
Jul 26, 2014

very simple one

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Prince Mishra
Jul 11, 2014

simple calculation

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Scarlett Red
Jul 6, 2014

(2a) = 2 x 0.5 = 1
1^2 = 1 x 1 = 1
a^2 = 0.5 x 0.5 = 0.25
7 x 0.25 = 1.75
1 + 1.75 = 2.75
(2a)^2 + 7(a^2) = 2.75




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If you have any questions, ask

Scarlett Red - 6 years, 11 months ago

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No one will have questions for such an easy problem.

Anuj Shikarkhane - 6 years, 11 months ago

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Well, you never know. But it is really easy, I know.

Scarlett Red - 6 years, 11 months ago

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