What times what equals -72 but also adds up to -1. factor quadratic expressions

8 and -9

Step-by-step explanation: Let x be the first number we are looking for and y the second number.

We know that x*y=-72

Also we know that x+y=-1 from this x=-1-y

Subtitue x to the first equation to get:

(-1-y)*y=-72

-y^2-y=-72

0=y^2 +y -72

To solve it with factor method we use that 72=8*9 and 9-8=1

y^2+y-72= (y-8)(y+9)=0

Thus y=8 or y=-9

x=-1-y from above

Thus x=-9 or x=8

Lets check if y=8 and x=-9 than 8*-9=-72 and 8+(-9)=-1

The same is true for the above pair as it is the same solution just x and y switched.

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)