4 years ago

Solve. 2x2 + 3x = –8

1 answer:

6 0

$2x^2+3x=-8\ \ \ \ |add\ 8\ to\ both\ sides\\\\2x^2+3x+8=0\\a=2;\ b=3;\ c=8\\\\\Delta=b^2-4ac\\\\\Delta=3^2-4\cdot2\cdot8=9-64=-75 \ \textless \ 0\\\\Answer:No\ real\ solution$

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The places X and Y are 76km apart on a highway one car starts from Y and other from X at the same time. If the cars travel in th

Julli [10]

Answer:

Fast car = 45.6

Slower car = 30.4

Step-by-step explanation:

Let the speed of the first car = x

Let the speed of the second car = y

Travelling towards each other.

x *1 + y*1 = 76 miles

x*5 - y*5 = 76 miles. This is kind of tricky. You have to understand that the first car that is 76 miles from the second car and makes up that 76 in 5 hours. The distance they both travel is subtracted out.

Divide by 5

x - y = 76/5

x - y = 15.2 The speeds differ by 15.2

x + y = 76

x - y = 15.2

2x = 91.2

x = 45.6

y = 76 - 45.6 = 30.4

When the two vehicles speeds are multiplied by 5, the difference is 76 km

5 0

3 years ago

Confused on this one. I need someone to help me out.