Question

3. Which of the following is NOT factorable? A. x^2 + 6x + 9 B. a^2 – b^2 C. x^3 – 125 D. x^2 + y^2

Answer 1

Answer:

The correct answer is option (D)

Step-by-step explanation:

$x^2+6x+9=(x+3)^2\\a^2-b^2=(a+b)(a-b)\\x^2-125=x^3-5^3=(x-5)(x^2+5x+25)$

So $x^2+y^2$ is not factorable

Answer 2

$\huge\fcolorbox{blue}{red}{\color{lime}{Ꭺɴꮪꮃꭼꭱ}}$

(D) $\bf{ \red{{x}^{2} } \green{+ }\red{ {y}^{2} }}$