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3 years ago

12

Which shows the factored form of x2 – 12x – 45?

2 answers:

Oxana [17]3 years ago

6 0

Hi!

(x+a)·(x+b) = x²+xa+xb+ab = x²-12x-45

x² = x²
xa+xb = (a+b)x = -12x ⇒ (a+b) = -12
ab = -45

When (a+b) = -12 and ab = -45?

+3-15 = -12 and (+3)(-15) = -45
-3-15 = -18 and (-3)(-15) = +45
+3+15 = +18 and (+3)(+15) = +45
-3+15 = +12 and (-3+15) = -45

Answer:

(x+3)(x-15)

elixir [45]3 years ago

4 0

Answer:

Howdy ya'll!!!

Step-by-step explanation:

I know that the answer would be (x+3) and (x-15). Good luck on whatever you are doing!!

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