Question

Which number is a solution of the inequality?

x(7 – x) > 8
BUT MY ANSWER IS 1.438447
MY ANSWER CHOICES ARE

A.

2

B.

8

C.

–1

D.

0

Answer 1

x=0.
7-x>8
-x>8-7
-x>1
x<-1

Answer 2

If we plug in 2 we will get 2(7-2)>8
2(5)>8
10>8
If that true?

Answer 3

The answer is C

Answer 4

If we plug in 8 we get 8(7-8)>8
8(-1)>8
-8>8
Is that true?

Answer 5

Maths911 answer is wrong actually, the answer is 2

Answer 6

If we plug in -1 we get
-1(7-(-1)).8
-1(8)>8
-8>8
Is that true?

Answer 7

If we plug in 0 we get 0(7-0)>8
0>8
Is that true?

Answer 8

A. 2

x(7 – x) > 8
7x - x^2 > 8
x^2 - 7x +8 < 0
x = (7 +/-V17) / 2
-> x = 5.56, 1.43
=> Since the solution range ( 1.43, 5.56) which satisfies x = 2