Quadratic equations and complex numbers ppease answer asap

12.

15.

Step-by-step explanation:

12.

To solve this quadratic equation, we will put all the variables and constants on one side of the equation and factorize it.

Therefore, the solutions to the given expression are 3(1/2) and 6.

15.

Squaring both the sides to get:

Therefore, the solution to the given expression is 4.

so the possibilities of the measurement of the side of the triangle are either it is longest side or not the longest side

when it is the longest side

s < 25 + 35s < 60

if it is not the longest side

35 < 25 + s10 < sso 10 < s < 60so the perimeter70 < p < 130

3 3 6, because in every triangle the longer side is always shorter than the sum of the other two