# 4. A rectangular courtyard is 18m72cm long and 13m20cm broad. it is to be paved

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1 1 1. he LCM and HCF of the following pairs of integers and verify that LCM X HCF product of integers (i) 26 and 91 (ii) 510 and 92 (iii) 336 and 54 Solution- 26) 91 ( HCF 13 LCM 13 x2 x7 182 Ist number x 2 nd number HCF X LCM 26 X91 13 X Find the LCM and HCF of the following integers by applying the prime factorization method (i) 12,15 and 21 (ii) 17,23 and 29 (iii) 8,9 and 25 (iv) 40,36 and 126 (v) 84,90 and 126 (vi) 24,15 and 36 Solution (I) 122X2 X 3 HCF3 153X5 LCM2X2X3X5X X7 3. Find the greatest number of 6-digit exactly divisible by 24,15 and 36 Solution- The greatest 6-digit number is To find the LCM of 15,24, ,24, ,12, , 6, 9 5, 2, 3 LCM 2 x2 x3x5x2x3360 The greatest 6-digit number is A rectangular courtyard is 18m72cm long and 13m20cm broad. it is to be paved With square tiles of same size.find the least possible numbers of such tiles

2 2 Solution- length1872cm breadth 1320cm HCF of 1872 and 1320 is 24 No. of tiles Find the least numbers that is divisible by all the numbers between 1 and 10 ( both inclusive) Solution- Find the LCM of 1,2,3,4,5,6,7,8,9,10 2 1,2,3,4,5,6,7,8,9,10 2 1,1,3,2,5,3,7,4,9,5 2 1,1,3,1,5,3,7,2,9,5 3 1,1,1,1,5,1,7,2,3,5 5 1,1,1,1,1,1,7,2,3,1 This is the required number LCM2x2x2x3x5x7x2x What is the smallest number that when divided by 35,56 and 91 leaves remainders 7 of in each case?. Solution- The LCM of 35,56and ,56, 91 5, 8,13 LCM 7 x 5 x 8 x Hence required number is In morning walk three persons step off together,their steps measure 80cm,85cm and 90cm respectively. what is the minimum distance each shoud walk so

3 3 that he can cover the distance in complete steps? Solution- The LCM of 80,85and ,85, 90 5, 40,85,45 5, 17,9 LCM 2x5x5x17x m40cm 8. Determine the number nearest to but greater than which is exactly divisible by 8,15 and 21 Solution- The LCM of 8,15and 21 now ,15,21 Remainder 800 8, 5,7 The required no. is LCM 3 x8 x 5 x find the smallest number which leaves remainders 8 and 12 when divided by 28 and 32 respectively Solution- The LCM of 28 and , , 16 7, 8 LCM 2x2x7x8224 But remainders are 8 and 12 So required number Find the smallest number which when increased by 17 is exactly divisible by

4 4 both 520 and 468 Solution- The LCM of 520 and , , , 130 9, 10 LCM 2x2x13x9x Required number A circular field has a circumference of 360km.Three cyclist starts together and can cycle 48,60 and 72km a day, round the field When will they meet again? 12. The LCM and HCF of two numbers are 180 and 6 respectively. If one of the numbers is 30, find the other number. Solution- 1 st no. x 2 nd no. LCMx HCF 30. x 2 nd no. 180x 6 2 nd no The HCF of two numbers is 16 and their product is 3072.Find their LCM Solution- 1 st no. x 2 nd no. LCMx HCF 3072 LCM X 16 LCM The HCF of two numbers is 145 and their LCM is If one of the

5 5 numbers is 725, find the other number. Solution- 1 st no. x 2 nd no. LCMx HCF 725 X 2 nd no X nd no Can two numbers have 16 as their HCF and 380 as their LCM? Give reason Solution- No, because 380 is not divisible by 16

6 6 POLYNOMIALS EXERCISE-2.1 Q1- (i) sum 2 x 2-2x-8 X 2 +(-4+2)x-8 product -8 (X 2-4x)+(2x-8) X(x-4) +2(x-4)0 (x-4)(x+2)0 X4,-2 Sum 4+(-2)2 Product4 x-2-8 (v) +10x+7 sum +(7+3)x+7 product 7 ( +7x)+(3x+7 )0 (x + ) +3( x + )0 X- - x Sum Product - - x 7

7 7 (vi) x 2 -( sum (X 2 - -(x + x(x- product (x-1)0 x Sum +1 Product x1 (vii) a(x 2 +1)-x(a 2 +1) sum ax 2 +a-xa 2 -x ax 2 -(a 2 +1)x+a product 1 (ax 2 -xa 2 )-(x+a) ax(x-a)-1(x-a)0 (x-a)(ax-1)0 Xa, Sum Product a x 1

8 8 Part no. (ii) (iii) and (iv) are similar Q2- if α and β are the zeros of quadratic polynomials ax 2 +bx+c then evaluate (i) α β iii - (iv) (v) (vi) + (ii) - (vii) + Solution- the zeros of quadratic polynomial is α β α β - 2 2a 2a a α β a -b + -4ac -b + -4ac

9 9 2a 2a (-b) ac) 2 4a 2 b ac 4a. a a a (iii) (iv) ) x (v) Solve on page no.229 example 8 RDSAHARMA (vi) +

10 10 (vii) + -2 Q3-6x 2 +x-2 evaluate + Solution- + sum Q4- x 2 -x-4, evaluate + Solution- sum 1-4 +

11 11 - Q5-p(x) 4x 2-5x-1 evaluate Solution - sum Q6-f(x)x 2 +x-2 evaluate - Solution- - Sum -1, -2 3 Q7-x 2-5x+4 evaluate, +

12 12 Solution- sum ) Q8-f(t)t 2-4t+3 evaluate Solution - sum 4 3 ( ( 192 Q9- p(y)5y 2-7y+1 evaluate, + Solution - sum 7 Q10-p(s) 3s 2-6s+4 evaluate, Solution - sum

13 x 8 Q11- x 2 -px+q prove that +2 Solution - sum p q -2q +2 Q12- Q13-if the sum of zeros of quadratic polynomials is f(t)kt 2 +2t+3k Is equal totheir product,find the value of k Solution - sum 3 According to statement

14 14 3, k Q14- Q15-if are zeros of quadratic polynomial f(x)x 2-1, find a quadratic polynomial whose zeros are Solution - sum 0-1 sum -4 product 4 Required polynomial is f(x)k(x 2 -sx+p) k(x 2 -(-4)x+4) k(x 2 +4x+4) Q16- if are zeros of quadratic polynomial f(x)x 2-3x-2, find a quadratic polynomial whose zeros are Solution - sum 3-2 sum

15 15 Product Required polynomial is f(x)k(x 2 - x+ ) Q17-- if are zeros of quadratic polynomial such that and find a quadratic polynomial whose zeros are Solution 2, 16,, Required polynomial is f(x)k(x 2 -sx+p) k(x 2-24x+128) Q18- if are zeros of quadratic polynomial f(x)x 2 -p(x+1)-c then show that ( Solution x 2 -px-p-c x 2 -px-(p+c) Sum p, -(p+c)

16 16 ( 1-c Q19- if are zeros of quadratic polynomial f(x)x 2-2x+3, find a quadratic polynomial whose zeros are (I) (ii) Solution Sum 2, 3 (i) sum 2+46 product )+4 3+2(2)+411 Required polynomial is f(x)k(x 2 -sx+p) k(x 2-6x+11) (ii) Sum Product Required polynomial is f(x)k(x 2 - x+ )

17 17 Q20- if are zeros of quadratic polynomial f(x)x 2 +px+q, find a quadratic polynomial whose zeros are (I), Solution Sum -p, q sum + ) Product X { { { Required polynomial is f(x)k(x 2 -sx+p) k{x 2-2 x+ } JANAK RAJ KALIA (TGT MATHS ) IF YOU WANT WHOLE SA-1 UNSOLVED EXERCISE OF SA-1 CLASS X,THEN CONTACT ,

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