Question

For the quadratic equation
$x {}^{2} + 6x = 16$
what should be the third term to make LHS a complete square?

(A)-9
(B)9
(C)25
(D)4

step by step explanation.​

Answer 1

Answer:

B) 9

Step-by-step explanation:

${x}^{2} + 6x = {x }^{2} + 2(x)(3)$

To make it perfect square we have to add square of 3 which means 9.