Use substitution to write an equivalent quadratic equation. (3x + 2)2 + 7 (3x + 2) – 8 = 0 - u2 + 74 - 8 = 0, where u = (3x + 2)2 u2 + 7u - 8 = 0, where u = 3x + 2 u2 + 70 - 8 = 0, where u = 7(3x + 2) lu² +4-8=0 what’s the answer?

For this case we can make a change of variable, to obtain a quadratic equation of the form:

Making the change:

Substituting the change we have:

Thus, the correct option is:where

Option B

second option:

Step-by-step explanation:

We have the equation given:

We can replace the variable in the quardatic equation.

So,

Putting u in place of 3x+2 will give us:

So the answer is:

So, the second option is correct ..

75 tickets have been sold so far.

step-by-step explanation:

in this question it is clearly mentioned that 45 children's tickets have been sold and this number is 60% of the total tickets sold.

now let's assume the total number of tickets sold be x.

then 60% of x = 45

⇒

⇒ x(.6) = 45

by dividing with .6 on both the sides of the equation

⇒ x = 75

therefore 75 tickets have been sold so far.

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step-by-step explanation:

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