A car starts from rest and gains velocity 20 m/s In 10 sec . find its acceleration​

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

Solution: x2+4x=276x=27,x=9/2answer: no