Question

Find the sum of
a,-3a,5a and -7a is​

Answer 1

a + (-3a) +5a +(-7a)

= a + 2a -7a

= 3a -7a

= -4a

Answer 2

Answer:

$\red{ = 1a + ( - 3a) + 5a + ( - 7a)} \\ \red{ = 1a - 3a + 5a - 7a} \\ \red{ = 1a + 5a - 3a - 7a} \\ \red{ = 6a - 10a} \\ \red{ = - 4a}$

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