All Questions Topic List
None Questions
Previous in All Question Next in All Question
Previous in None Next in None
Question Number 42543 by solihin last updated on 27/Aug/18
Commented by solihin last updated on 27/Aug/18
question1please
Commented by maxmathsup by imad last updated on 27/Aug/18
1)wherethisequationisdefined?wemusthave2x+1⩾0and12x2+12x+7=→Δ′=62−12×7<0⇒∀x12x2+12x+7>0sowemusthavex⩾−12(e)⇒12x2+12x+7=(2x+1)4=(4x2+4x+1)2⇒12x2+12x+7=(4x2+4x)2+2(4x2+4x)+1⇒12x2+12x+7=16(x4+2x3+x2)+8x2+8x+1⇒16x4+32x3+24x2+8x+1−12x2−12x−7⇒16x4+32x3+12x2−4x−6=0⇒8x4+16x3+6x2−2x−3=0therootsofthisequationarex1∼−1,5(real)x2∼−0,5+0,5i(complex)x3∼−0,5−0,5i(complex)x4∼0,5(real)x1isnotsolutionbecausex1<−12sotheuniqueslutionisx4∼12.
afterverificationweseethatx0=12isaexactsolutionforthisequation.
Terms of Service
Privacy Policy
Contact: info@tinkutara.com