Answer:
$68.60
Step-by-step explanation:
If the original price is $98
30% = 0.03
0.30*98=29.40
Then, 98−29.40=$68.60
Foil (x-1)(x-1)(x-1) gives you x^3-3x^2+3x+1
(<span>x^3-3x^2+3x+1)(3X-3) foil
</span>gives you 2x^4-9x^3+15x^2+11x-3
for the other side
(x-1)(x-1)= x^2-2x+1
(2x+1)(x^2-2x+1) = 2x^3-3x^2+1
(2x^4-9x^3+15x^2+11x-3) - (<span>2x^3-3x^2+1)
</span>=2x^4-11x^3+18x^2+11x-4
First distributive property to get 7x+10-26=144, now add common like terms to get 7x-16=144 now add 16 to both sides to get 7x=160, now divide by 7 to leave x by itself and get x=22.86 or x=160/7
The answer is -7 because :
a=1, b=1, c=2
Discriminant = b^2 - 4ac
= 1^2 - 4*1*2
= -7