Y=x^2+3x+4
y-x=7

x^2+3x+4-x=7
x^2+2x+4=7
(factor) x^2+2x-3=0
(x+3)(x-1)=0
X= -3 and X=1
(Plug x in for y)
Y= 1^2+3(1)+4
Y=8
(Check your answer on the second equation)
8-1=7
7=7 (Which is the solution)

5 0

2 years ago

Qbjsksnnfkkdnnwnnsiodnnjfkjbbskkxkkdn

iris [78.8K]

Answer:

There are 25 students in the class.

Step-by-step explanation:

Since we know the percentage of students who want an ice cream party is 20%, and 5 students want an ice cream party, we know that:

$\frac{5}{S}=0.2$

, where S is the total amount of students. We can then solve for S:

$\frac{5}{S}=0.2$ Given equation

$5=0.2*S$ Multiply by S

$25=S$ Divide by 0.2

Therefore, there are 25 students in the class.

7 0

2 years ago

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If x – 10 is a factor of x2 – 8x – 20, what is the other factor?

kkurt [141]

Answer:

Step-by-step explanation:

x²-8x-20

=x²-10x+2x-20

=x(x-10)+2(x-10)

=(x-10)(x+2)

second factor is x+2

5 0

2 years ago

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