Question

x^2+4x+9=0 where D=b^2-4ac​

Answer 1

Step-by-step explanation:

The first term is,  x2  its coefficient is  1 .

The middle term is,  -4x  its coefficient is  -4 .

The last term, "the constant", is  +9 

Step-1 : Multiply the coefficient of the first term by the constant   1 • 9 = 9 

Step-2 : Find two factors of  9  whose sum equals the coefficient of the middle term, which is   -4 .

     -9   +   -1   =   -10     -3   +   -3   =   -6     -1   +   -9   =   -10     1   +   9   =   10     3   +   3   =   6     9   +   1   =   10