Answer: -4
Step-by-step explanation:
3 times that number→3x
Difference of the square of a number and 28→x^2-28
x^2
−28=
3x
-3x
=-3x
x^2-3x-28=0
(x-7)(x+4)=0
x-7=0
x+4=0
x=7 x=-4
{Negative Solution: }-4
Negative Solution: −4
The answer is 43 because 3*3*3=27 and 4*4=16
s is the MPH.
t is the amount of time.
Lisa traveled 120 miles at a speed of s miles, and we want to find t, the time. We need to divide the distance of 120 by the speed of s.
The answer is 120/s = t.
Let's solve your equation step-by-step.
5
x
2
−
43
x
=
18
5
x
x
+
−
43
x
=
18
Multiply all terms by xx and cancel:
5
+
−
43
x
=
18
x
x
−
43
x
+
5
=
18
x
2
(Simplify both sides of the equation)
−
43
x
+
5
−
18
x
2
=
18
x
2
−
18
x
2
(Subtract 18x^2 from both sides)
−
18
x
2
−
43
x
+
5
=
0
(
−
9
x
+
1
)
(
2
x
+
5
)
=
0
(Factor left side of equation)
−
9
x
+
1
=
0
or
2
x
+
5
=
0
(Set factors equal to 0)
x
=
1
9
or
x
=
−
5
2
Check answers. (Plug them in to make sure they work.)
x
=
1
9
(Works in original equation)
x
=
−
5
2
(Works in original equation)
Answer:
x
=
1
9
or
x
=
−
5
2
Answer:
164
Step-by-step explanation:
9 times 18 =162
162 + 2= 164
