Question

Find all natural numbers x such that the product of their digits (in decimal notation) is equal to x^2 -10x-22

Answer 1

Explanation:

Taking the set of natural numbers as the universal set, write down the complements of the following sets :

(i) {x : x is an even natural number}

(ii) {x : x is an odd natural number}

(iii) {x : x is a positive multiple of 3}

(iv) {x : x is a prime number}

(v) {x : x is a natural number divisible by 3 and 5}

(vi) {x : x is a perfect square}

(vii) {x : x is a perfect cube}

(viii) {x : x + 5 = 8}

(ix) {x : 2x + 5 = 9}

(x) {x:x≥7}

(xi) {x:x∈Nand2x+1>10}

Answer 2

Answer:

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