f(4)=36
Step-by-step explanation:
f(x)=x^2+5x
f(4)=??
you need to put the number 4 instead of x in the equation.
f(4)=(4)^2+(5×4)
f(4)=16+20
f(4)=36
Answer:
is there more info in the problem?
Step-by-step explanation:
Answer:
The temperature in degrees Celsius is 165
Step-by-step explanation:
As given
The conversion formula of Fahrenheit to Celsius is
(°F − 32) × 5/9 = °C
Where
F = temperature in Fahrenheit
Substituting the given values, we get -
The temperature in degrees Celsius is 165
Combine like terms
2x^2 + -7x^2 = -5x^2
-9x + 4x = -5x
3 + -2 = 1
put back together
-5x^2 - 5x +1
The number is x
it is negative
the square is 28 more than 3 times itself
x²=28+3x
minus (28+3x)
x²-3x-28=0
factor
(x-7)(x+4)=0
set to zero
x-7=0
x=7
this is not the answer because we were told the number was negative
x+4=0
x=-4
correct
the number is -4
test
(-4)²=28+3(-4)
16=28-12
16=16
check
the number is -4
