Question

3
if 2^7x-^7 = 1 then x =
(a) 1
(b) 2
(c) 0
(d) 3​

Answer 1

Answer:

x2 - 7x - 7  = 0

Step-by-step explanation:

Factoring  x2-7x-7  

The first term is,  x2  its coefficient is  1 .

The middle term is,  -7x  its coefficient is  -7 .

The last term, "the constant", is  -7  

Step-1 : Multiply the coefficient of the first term by the constant   1 • -7 = -7  

Step-2 : Find two factors of  -7  whose sum equals the coefficient of the middle term, which is   -7 .

     -7    +    1    =    -6  

     -1    +    7    =    6  

Observation : No two such factors can be found !!

Conclusion : Trinomial can not be factored

Equation at the end of step

1

:

 x2 - 7x - 7  = 0