Question

which of the following is a quadratic equation...
a. (4-x) (3x+1) =2-3x^2
b. (x+3)^3-5=x^2+9
C. (k-4)x^2-3x=9 k=4
D.) (x+1)^3=x^3-5
Plz give the answer with method ​

Answer 1

Answer:

Good morning

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Answer 2

Step-by-step explanation:

(x + 1)2 = 2(x – 3)

We have:

(x + 1)2 = 2 (x – 3) x2 + 2x + 1 = 2x – 6

⇒ x2 + 2x + 1 – 2x + 6 = 0

⇒ x2 + 70

Since x2 + 7 is a quadratic polynomial

∴ (x + 1)2 = 2(x – 3) is a quadratic