OK. <u>2 = -t² + 4t + 5</u>
Subtract 2 from each side: 0 = -t² + 4t + 3
Multiply the right side by -1 : 0 = t² - 4t - 3
Unfortunately, this can't be factored. The only other way I know
to find the solutions to a quadratic equation is with the use of the
quadratic formula. When you do that, you get these solutions:
t = 2 + √7 = about<em> 4.65</em>
and
t = 2 - √7 = about <em>-0.65</em> .
If this equation comes from a problem that involves real people throwing
real things into the air and making vertical motion, then you want only the
positive solution.
As a fraction, it can’t be simplified. As a decimal, it’s 0.375.
Answer: (5,10)
Step-by-step explanation:
multiply first equation with 2 and add it to second to eliminate X
7x-5y=-15 //*2
14x-10y=-30
-14x+7y=0
----------------
-3y=-30
y=-30/-3
y=10
7x=50-15
7x=35
x=35/7
x=5