Question

A student says that the zeros of the quadratic equation y = x2 – 10x + 21 are
-3 and - 7. Is the student correct? If not, describe and correct the error the
student made.

Answer 1

Answer:

No, x=3 x=7

Step-by-step explanation:

x²-10x+21 = 0

Step 1: Factor left side of equation.

(x−3)(x−7)=0

Step 2: Set factors equal to 0.

x−3=0 or x−7=0

x=3 or x=7