PLS HELP.... If 4x^2 + bx + 9 = 0, where b is the constant, has exactly one solution, what is a possible value of b ?

2 answers:

3 0

You can use the discriminant rule, which is :
b^2 -4ac
“exactly one solution” means that it is equal to zero
so:
b^2 -4(4)(9)=0
b^2 -4(36)=0
b^2 -144=0
b^2=144
square root both sides
b=12 or -12

hope this helps !

Elden [556K]3 years ago

3 0

Answer:

Since the equn is quadratic and has equal roots, it's delta k^2–4*4*9 =0 => k= (+ or -) 2*2*3 = (+ or -) 12

Step-by-step explanation:i hope this is correct im so sorry if not aizawa

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