Equation: x∣x+4∣+3∣x+2∣+10=0.
Critical points: x=−4,−2.
Case 1:
x≥−2: x(x+4)+3(x+2)+10=0
⇒x2+7x+16=0.
Discriminant =49−64=−15<0. No real roots.
Case 2:
−4≤x<−2: x(x+4)−3(x+2)+10=0
⇒x2+x+4=0.
Discriminant =1−16=−15<0. No real roots.
Case 3:
x<−4: −x(x+4)−3(x+2)+10=0
⇒x2+7x−4=0.
x=2−7±65.
x=2−7+65≈0.53 (rejected, not in x<−4). x=2−7−65≈−7.53 (valid).
Number of distinct real solutions =1.