Answer:
x =-5± 2i sqrt(14)
Step-by-step explanation:
x^2 + 10x= -81
Take the coefficient of x and divide by 2
10/2 = 5
Square it
5^2 =25
add to each side
x^2 + 10x+25 = -81+25
( x+5) ^2 = -56
Take the square root of each side
sqrt(( x+5) ^2) =± sqrt(-56)
x+5 = ± sqrt(-1) sqrt(4*14)
x+5 =± i sqrt(4)sqrt(14)
x+5 =± i 2 sqrt(14)
Subtract 5 from each side
x+5-5 =-5± i 2 sqrt(14)
x =-5± 2i sqrt(14)
D divide by 1000… you are shifting the decimal 3 places (there are 3 zeros in 1000) you are dividing because the number is getting smaller.
Answer:
it would be 58
Step-by-step explanation:
if you do 72 x 417 it would be 5 at the top and 360 would be at the bottom so it would be 417-360 which is 57 and the six at the top u would drop so now it is 576 so if you do 72 x 8 it would be 576 so u would put the 8 with the 5 and subtract the 576 - 576 and that is 0 BOOM
4x is the answer of the equation 3x-7=5x+1