Sushil was thinking of a number. Sushil adds 7 to it, then doubles it and gets an answer of 85.5. What was the original number?
2 answers:
You might be interested in
Answer:
D
Step-by-step explanation:
a perfect square trinomial is
factorized is
so as you can see option A and B can't be, because they have -49y^2 and it has to be plus
so the other options are C and D
in the trinomial a=4 and b=\pm 7
the roots of a^2 and b^2
so it's option d with b=-7