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Leokris [45]
3 years ago
15

Please help me out please please y'all help please please ASAP please

Mathematics
1 answer:
lutik1710 [3]3 years ago
4 0

Answer:

x=20

Step-by-step explanation:

(4x-12)+(x+2)=90

5x-10=90

5x=100

x=20

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to solve x² - 2x = 15, we need to get all the terms on one side so we can solve the quadratic equation using factoring. to do this, we subtract 15 from both sides

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now we can factor. we need 2 numbers that when multiplied together give us -15, and when those 2 numbers are added together we get -2

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we can use 3 and -5 as factors and test it out. we put x in front because we have an x²

(x - 5)(x + 3) < we can FOIL to check to see if this is correct. its not mandatory to check but when you arent sure of the answer you can FOIL it out

FOIL stands for: First, Outside, Inside, and Last terms

F: (x - 5)(x + 3) = x²

O: (x - 5)(x + 3) = -3x

I: (x - 5)(x + 3) = 5x

L: (x - 5)(x + 3) = -15

x² + 3x - 5x - 15 < subtract 3x from 5x

x² - 2x - 15

this checks out, so our answer is (x - 5)(x + 3)

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