Question

How we can know from equation that which graph opens upwards and which graph open downwards pls help me i want step by step explanation of this? ​

Answer 1

only in (a) option, coefficient of x^2 is positive. so , it opens upwards

Answer 2

a. p(x) =x^2+8x+12 is correct answer because if we put any value in (x) place we can get the curve upwards.