Answer:
3/20, -3/10
Step-by-step explanation:
Its a quadratic equation, use the quadratic formula. (-b+-[tex]\sqrt{b^2-4ac\\}[/tex])/2a
20x^2+3x-2=0
(-3+-[tex]\sqrt{9+80}[/tex])/40
(-3+-9)/40
So you get 6/40=3/20 and -12/40=-3/10
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
