Question

What are the solutions of -x2 + 4x = x - 4?

O-5 and 0
0-5 and -1
0-1 and 4
O and 4

Answer 1

Answer: C

-1 and 4

Explanation:

Answer 2

-1 and 4

Explanation:

first you bring the terms on the right side to the left and you get:

-x^2 + 3x + 4 = 0

then you divide both sides of the quadratic by -1:

x^2 - 3x - 4 = 0

then you factor the equation:

(x + 1)(x - 4) = 0

for any product to be zero, one of the factors must be zero. hence, either x + 1 or x - 4 can be zero. so x can be -1 and//or 4.

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