John is five years older than his sister. the product of their present ages is 150.
john's present age is (blank) years, and this sister's present age is (blank) years
so i believe you have to answer this with the quadratic formula but i'm not sure.

john's age= x + 5

his sister's age= x

x + 5 + x = 150

2x + 5 = 150

2x = 150 - 5

2x = 145

x = 145 ÷ 2

x = 72.5

so, 72.5 + 5 = 77.5

john's present age is = 77.5

his sister's present age is = 72.5

John is 15, his sister is 10

Step-by-step explanation:

15×10=150

(f - g)(x) = 5x^3 - 3

step-by-step explanation:

rearrange these functions vertically, with like terms in separate columns:

f(x) = 5x^3 - 2

g(x) =         +1

now subtract, column by column:

(f - g)(x) = 5x^3 - 3