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

Answer 1

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

Answer 2

i think its a

Answer 3

A

Answer 4

no it cant be. -7 doesnt solve that equation

Answer 5

so i got D

Answer 6

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

Answer 7

ohhh i get my sighs messed up thanks