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lidiya [134]
3 years ago
8

20x2 + 3x + 5 = 7 Help

Mathematics
2 answers:
lys-0071 [83]3 years ago
7 0

Answer:

for 20·x+3x+5=7, x= -38/3

for 20x^2+3x+5=7, x=-2/5, x=1/4

sorry, I don't know if the x after the two is a multiplication symbol, or a variable squared, so I put both answers. I hope this helps.

Step-by-step explanation:

first variation:

1) multiply:

40+3x+5=7

2) add:

45+3x=7

3) move the 45:

3x=7-45

4) solve:

3x=-38

x=-38/3

second variation:

1) move constant to the left:

20x^2+3x+5-7=0

2) simplify:

20x^2+3x-2+0

3) use the quadratic formula:

a=20, b=3, c=-2

x=-3±√3^2-4×20×(-2)/2×20

4) solve:

x=1/4, x=-2/5

Mrac [35]3 years ago
3 0

Answer:

3/20, -3/10

Step-by-step explanation:

Its a quadratic equation, use the quadratic formula. (-b+-\sqrt{b^2-4ac\\})/2a

20x^2+3x-2=0

(-3+-\sqrt{9+80})/40

(-3+-9)/40

So you get 6/40=3/20 and -12/40=-3/10

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