general maffs marathon (1 Viewer)

annagurl

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Nooo its 7+3(x) :eek:
No way!
7x+3x

The x's cancel
so it's 7+3
and you take out the common factor which is 1
-1= i^2
so:
-7i^2 + -3i^2
and -i^2 is a common factor
so: -i^2(7-3)
-i^2(4)
-2i x 2i
-i2(1-1)
=i2 x 0
= 0

therefore, answer is zero
 
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Parvee

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No way!
7x+3x

The x's cancel
so it's 7+3
and you take out the common factor which is 1
-1= i^2
so:
-7i^2 + -3i^2
and -i^2 is a common factor
so: -i^2(7-3)
I never learnt that in general :/
 

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