Find all missing angles. m∠1 = m∠2 = m∠3 = m∠4 =

Angle 1 =51. 72+57=129. 129+51=180

Angle 2=18. there is a right angle 72+18=90

Angle 3=123

Angle 4=39 angle 2+angle 3+angle 4 equals 180

123+18=141

180-141=39

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

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step-by-step explanation: