Step-by-step explanation:
f(x)=-x²+8x
By replacing x with -7, we get
f(-7)=-(-7)²+8×(-7)
=-49-56
=-105
Answer:
A. 7 centimetres and 25 centimetres
Step-by-step explanation:
To see if the lengths make a triangle, use the Pythagorean theorem. Insert the biggest value as c (the hypotenuse, which is always the longest side in a right triangle). If both sides equal each other, it is a right triangle:

A.

This is a right triangle.
B.

Not a right triangle.
C.

Not a right triangle.
D.

Not a right triangle.
Done :D
Step-by-step explanation:
the answer is the last one, because if you plug in (5, -6) to both equations you would get equal answer.
Answer:

Step-by-step explanation:
If you are talking about radical expressions, then the two equations should be something like

Assuming this is the intended expression, then:

We then simplify by collecting LCM to obtain:
