Question

Find the value of: 5a2 – 7a – 8a2 + 4a2

Answer 1

given,

$5a^2-7a-8a^2+4a^2\\=5a^2-7a-8a^2+4a^2\\=5a^2-8a^2+4a^2-7a\\\mathrm{Add\:similar\:elements:}\:5a^2-8a^2+4a^2=a^2\\=a^2-7a$

Answer 2

Given : 5a² – 7a – 8a² + 4a²

To Find : value

Solution:

5a² – 7a – 8a² + 4a²

Like terms are the terms whose variables and their exponents are the same.

Rearrange the terms and bring like terms together

5a²  +  4a²  -  8a²  - 7a

= 9a²  -  8a²  - 7a

=  a²  - 7a

= a (a - 7)

5a² – 7a – 8a² + 4a²  = a²  - 7a  

=  a (a - 7)

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