Which of the following equations have only one solution? Select all correct answers. x²-x-6=0
5x2+ 20 x + 20 = 0
9x2.25 = 0
4x2+4 x=0
x2+6** 9 = 0

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.