Question

Which function has real zeros at x = 3 and x = 7?

f(x) = x2 + 4x – 21
f(x) = x2 – 4x – 21
f(x) = x2 – 10x + 21
f(x) = x2 – 10x – 21

Answer 1

@triciaal

Answer 2

@Directrix

Answer 3

@iGreen @iambatman

Answer 4

x = 3
x-3 = 0

x=7
x-7 =0

(x-3)(x-7)=0
find function

Answer 5

Break it down, if the zeros are 3 and 7, the binomials are going to be (x-3)*(x-7). Do you know how to multiply these?