we are given

we can use vertex form parabola formula

so, we can complete x square




so, option-A........................Answer
So, you already know that angle CBD is 68 degrees, and the complementary angle to angle CBD is angle CBA. These angles together make 180 degrees because segment DBA is a straight line consisting of angles CBD and CBA. 180-68(the angle you already know) is 112 degrees for angle CBA. Then you repeat this process to find the other angles
You use the substitution method simultaneously. He worked 9h at job A
Step-by-step explanation:

from difference of two squares:

therefore:

factorise out ¾ :
