Solve for x in the following equation
5x^2-27x-56=0
A.) x=-7;8/5
B.)x=-7;-8/5
C.)x=7;-8/5
D.)x=7;8/5

Question

Solve for x in the following equation 
5x^2-27x-56=0
A.) x=-7;8/5
B.)x=-7;-8/5
C.)x=7;-8/5
D.)x=7;8/5

anonymous · Answer

again, for these sorts of problems, it is faster to substitute the values and see which of them solve it.

anonymous · Answer

i think its a

anonymous · Answer

A

anonymous · Answer

no it cant be. -7 doesnt solve that equation

anonymous · Answer

so i got D

anonymous · Answer

see, there is a little trick you can use. With just two substitutions you can determine which is the correct answer. Suppose you substitute 7 in the equation, it solves it. so the answer is either C or D.
next substitute 8/5. it doesn't solve the equation. So it is not D.
so your answer has to be C

anonymous · Answer

ohhh i get my sighs messed  up thanks