Question

please help me to solve this question 4 question please

Answer 1

${b }^{2} - 4ac \: > 0$
distinct real roots
${b }^{2} - 4ac \: = 0$
equal real roots
${b }^{2} - 4ac \: < 0$
no real roots

also
${b }^{2} - 4ac \: is \: known \: as \: discriminant$

Answer 2

in no.3 ,given that the nth term of the AP is 3n+5, and find the common different, so to find th c.d we have to follow the AP process, a/q, 3×1+5=8 , 3×2+5=11 , so the common different will be 11-8=3 , so the c.d is 3