Answer:
Mistake in step 2
Explanation:
(x^2-10x+5)-(4x^2-1)
x^2-10x+5-4x^2+1
-3x^2-10x+6
-(3 x^2 + 10 x - 6)
There is a mistake in step 2 in the picture,
-(4x^2-1)
Here, -*- =+ and -*+=-, this is done incorrectly here,
the first mistake would be writing the 4x^2 as positive when it's supposed to be negative. the 1 is also supposed to be positive. correct difference would be:
=(x^2-4x^2)-10x+5+1
=-3x^2-10x+6
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