Question

if a+b=4 and a-b=2 find the value of a^2-b^2​

Answer 1

Answer: 6

Step-by-step explanation:

Using Idiom

(x - y)(x + y) = x² - y²

a² - b² = (a - b)(a + b)

= 4x2 = 6

Answer 2

Answer:

8

Step-by-step explanation:

a + b= 4  

a - b = 2    {solve with simultaneous equation}

= 2a = 6

a =3          a + b =4   =[3 + b = 4]    b = 4 - 3 = 1

a^2 - b^2

3^2 - 1^2

9 - 1 = 8

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