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Naily [24]
2 years ago
6

What is equivalent to the expression 5x - 4 - 9x +7

Mathematics
2 answers:
miskamm [114]2 years ago
7 0
5x - 4 -9x + 7
simplify
5x - 9x = -4x

-4 + 7 = 3

Answer: -4x - 3
Rom4ik [11]2 years ago
6 0
The answer is c.

5x-9x=-4x
-4+7=3
There for the answer would be -4x+3
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4x²+4x-35=0
factor: (2x+7)(2x-5)=0
2x+7=0, or 2x-5=0
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I don't see any rounding necessary in this case. 

when you factor ax²+bx+c, you take the two factors of a and the two factors of c, one factor of a times one factor of c, the other factor of a times the other factors, the sum of the two products make b.
in this case, the factors of 4 is 2 and 2, the factors of -35 is -5 and 7. I line them up in the following way:
2    -5

2      7
then I multiple them diagonally, the top left 2 multiplying the bottom right 7=14, and the other 2 multiplying -5=-10, 14 and -10 make a sum of 4.

if you don't get the desired sum, switch the factors up and down till you have the right combination. Note: Do not switch left and right. 

I hope this makes sense to you.
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