Yvonne is solving the quadratic equation 6x2 + 24x + 7 = 0 by completing the square. her first four steps are shown in the table. in which step did yvonne first make an error?

step 1
step 2
step 3
step 4

we have

step

Group terms that contain the same variable, and move the constant to the opposite side of the equation

-------> Yvonne first error( She added on one side and subtracted on the other)

step

Factor the leading coefficient

step

Complete the square. Remember to balance the equation by adding the same constants to each side

step

Rewrite as perfect squares

therefore

the answer is

Step 1

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)