Question

Solve
81^2+90x=-25
a.) 5/9
b.)-5/9
c.) no real solution
d.) plus minus 5/9

Answer 1

90x = -25 - 81^2
90x = -25 - 6561
Now it should be more easier.

Answer 2

Now just solve?

Answer 3

i am going to make a guess
my guess is the problem was
\[81x^2+90x=-25\] correct me if i am wrong

Answer 4

in which case you would write
\[81x^2+90x+25=0\] and then recognize the "perfect square" on the left and get
\[(9x+5)^2=0\] and you should be good from there yes?

Answer 5

not really :/

Answer 6

ok then if
\[(9x+5)^2=0\] that means that \[9x+5=0\] right?

Answer 7

and so if
\[9x+5=0\] we get
\[9x=-5\] and then \[x=-\frac{5}{9}\]

Answer 8

oh I see! Thanks!

Answer 9

yw