Allan is deriving the quadratic formula as shown ,a^2+bx+c=0. His work is incorrect. In which step did Allan first make an error?

4th option is correct xy=-10

if this was to u plzz mark me the brainliest

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared

the sum of the lengths of any two sides of a triangle is greater than the length of the third side. if you take the three sides of a triangle and add them in pairs, the sum is greater than (not equal to) the third side. if that is not true, then it is not possible to construct a triangle with the given side lengths.

step-by-step explanation: