Question

(-3+√5)(-3-√5)

please answer me step by step​

Answer 1

using identity,(x+y)(x-y)=x^2-y^2

so here.. x=-3 & y=root 5

so, (-3)^2 - (root 5)^2

= 9 - 5 = 4

Answer 2

(-3+√5)(-3-√5)

Comparing with a and b

a = -3

b = √5

we know that–

a² - b² = (a + b)(a - b)

Now,

(-3+√5)(-3-√5)

–› (-3)² - (√5)²

–› 9 - 5

–› 4

So, (-3+√5)(-3-√5) = 4