If b^2-4ac=0 determine the need or real solutions of the equation ax^2+bx+c=0

If  B² - 4 A C = 0 ,

then

Ax² + Bx + C = 0 has two real roots, and they are equal.

In other words,   Ax² + Bx + C  is a perfect square.

Here are the answers to the ones that i could see.

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.