SOLUTION: I actually have 2 questions and i am really having problems. i have tried the first one but it does not look right. and the second is a word problem one and i cant not even figur

Question 476930: I actually have 2 questions and i am really having problems. i have tried the first one but it does not look right. and the second is a word problem one and i cant not even figure out how to do this one.
for the randicand i am using the capital V

1. solve: 15x^2 + 7t = 2
put to standard: 15x^2 +7t - 2 =0
a=15 b=7 c= -2
x= -7+- V7^2 - 4(15)(-2)/2 * 15
x= -7+- V49-120/30

x = 1/6 or x = 0.3

the second one ( word prob.)
Abby rows 10 km upstream and 10 km back in a total of 3 hr. the speed of the river is 5 km/h. find abbys speed in still water.

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Please post questions one at a time. I'll do the first one to get you started.

# 1

Start with the given equation.

Get every term to the left side.

Notice that the quadratic is in the form of where , , and

Let's use the quadratic formula to solve for "x":

Start with the quadratic formula

Plug in , , and

Square to get .

Multiply to get

Rewrite as

Add to to get

Multiply and to get .

Take the square root of to get .

or Break up the expression.

or Combine like terms.

or Simplify.

So the solutions are or

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