Question

(√5 + √2) (√5 - √2) is equal to

(a) (√5 + √2) (b) (√5 - √2) (c) 3 (d) 5​

Answer 1

Answer:

(√5+√2)(√5-√2)

=(√5)*2-(√2)*2 {(a+b)(a-b)=a2-b2}

=5-2. [√5*√5=5,√2*√2=2]

=3

Hence, (c) 3 is correct.