Question

Please help quickly
The product of Lisa and her twin brothers is 36. The sum of their ages is 13 how old can Lisa be?

Answer 1

Answer:

the following link to a new thread for the use of

Answer 2

Answer: 2 years old or 4.5 years old

There are 2 possible answers

Step-by-step explanation:

To solve this equation, we can use the quadratic formula

L = Lisa’s age

x = The twin brother’s age

1. L × 2x = 36


From $2^{1}$ to 1


= (13 - 2x) × 2x = 36  

                  ÷ 2  ÷2


= x (13 - 2x) = 18  

= 13x - $2x^{2}$ = 18

= $2x^{2}$ - 13x + 18 = 0

= (2x - 9)(x - 2) = 0

We get 9 and 2 by plugging in numbers from X, 2, 3, 6, 9, 18 and seeing if they work or not.

= $2 x^{2}$ - 4x - 9x + 18 = 0

= $2x^{2}$ - 13x + 18 = 0

To prove that the there can be 2 ages, we do:

(A) x-2 = 0

= x = 2

(B) 2x - 9 = 0

= 2x = 9

= x  = 9/2 = 4.5

2. L + 2x = 13


$2^{1}$ : = L = 13 - 2x