Question

Which function has zeros at x = −2 and x = 5?
A. f(x) = x2 + 2x − 10
B. f(x) = x2 − 2x − 10
C. f(x) = x2 + 3x − 10
D. f(x) = x2 − 3x − 10

Answer 1

Answer:

D?

Step-by-step explanation:

Answer 2

The correct answer is option (d) x²-3x-10.

• The zeroes of the equaion are x = -2 and 5, so we will s=check the sum of roots = -b/a for each equation.
• For (a) f(x) = x²+2x-10, here -b/a = -2 and sum of zeroes = -2+5 = 3. So this is incorrect.
• For (b) f(x) = x²-2x-10 , here -b/a = 2 ≠ 3 , So this is also incorrect.
• For (c) f(x) = x²+3x-10, here -b/a = -3 ≠ 3 , So this is also incorrect.

• For (d) f(x) = x²-3x-10, here -b/a = 3 = 3, So option (d) is the correct answer, as in this case the su of zeroes = -b/a = 3.