Answer:
Step-by-step explanation:
hello :
x²-3x-10=0 means : (x-5)(x+2)=0
x-5=0 or x+2=0
conclusion two solutions : 5 and -2
5x+4+9x
14x+4 = simplest form
Basicly just plug in some nubers around the five like 3 + 5 - 10 = - 2 or 3 + unkown number - 10 = -2
Cos(x+90)=> -sinx
Cos90=sin
